MC9S08PA4 Reference Manual
Supports: MC9S08PA4
Document Number: MC9S08PA4RM
Rev. 6, 12/2017
MC9S08PA4 Reference Manual, Rev. 6, 12/2017
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Contents
Section number Title Page
Chapter 1
Device Overview
1.1 Introduction.....................................................................................................................................................................23
1.2 MCU block diagram....................................................................................................................................................... 24
1.3 System clock distribution................................................................................................................................................25
Chapter 2
Pins and connections
2.1 Device pin assignment.................................................................................................................................................... 29
2.2 Pin functions................................................................................................................................................................... 30
2.2.1 Power (VDD, VSS)..........................................................................................................................................30
2.2.2 Oscillator (XTAL, EXTAL)............................................................................................................................ 31
2.2.3 External reset pin (RESET) and interrupt pin (IRQ)....................................................................................... 32
2.2.4 Background/mode select (BKGD/MS)............................................................................................................ 33
2.2.5 Port A input/output (I/O) pins (PTA5–PTA0)................................................................................................. 34
2.2.6 Port B input/output (I/O) pins (PTB7–PTB0)..................................................................................................34
2.2.7 Port C input/output (I/O) pins (PTC3–PTC0)..................................................................................................34
2.2.8 True open drain pins (PTB0)........................................................................................................................... 34
2.2.9 High current drive pins (PTB4, PTB5)............................................................................................................ 34
2.3 Peripheral pinouts........................................................................................................................................................... 35
Chapter 3
Power management
3.1 Introduction.....................................................................................................................................................................37
3.2 Features...........................................................................................................................................................................37
3.2.1 Run mode......................................................................................................................................................... 37
3.2.2 Wait mode........................................................................................................................................................38
3.2.3 Stop3 mode...................................................................................................................................................... 38
3.2.4 Active BDM enabled in stop3 mode................................................................................................................38
3.2.5 LVD enabled in stop mode.............................................................................................................................. 39
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3.2.6 Power modes behaviors................................................................................................................................... 39
3.3 Low voltage detect (LVD) system..................................................................................................................................40
3.3.1 Power-on reset (POR) operation......................................................................................................................41
3.3.2 LVD reset operation.........................................................................................................................................41
3.3.3 Low-voltage warning (LVW).......................................................................................................................... 41
3.4 Bandgap reference.......................................................................................................................................................... 42
3.5 Power management control bits and registers................................................................................................................ 42
3.5.1 System Power Management Status and Control 1 Register (PMC_SPMSC1)................................................42
3.5.2 System Power Management Status and Control 2 Register (PMC_SPMSC2)................................................44
Chapter 4
Memory map
4.1 Memory map...................................................................................................................................................................45
4.2 Reset and interrupt vector assignments...........................................................................................................................46
4.3 Register addresses and bit assignments.......................................................................................................................... 47
4.4 Random-access memory (RAM).................................................................................................................................... 55
4.5 Flash and EEPROM........................................................................................................................................................56
4.5.1 Overview..........................................................................................................................................................56
4.5.2 Function descriptions....................................................................................................................................... 58
4.5.2.1 Modes of operation.......................................................................................................................... 58
4.5.2.2 Flash and EEPROM memory map...................................................................................................58
4.5.2.3 Flash and EEPROM initialization after system reset.......................................................................58
4.5.2.4 Flash and EEPROM command operations.......................................................................................59
4.5.2.5 Flash and EEPROM interrupts.........................................................................................................64
4.5.2.6 Protection......................................................................................................................................... 65
4.5.2.7 Security............................................................................................................................................ 68
4.5.2.8 Flash and EEPROM commands.......................................................................................................70
4.5.2.9 Flash and EEPROM command summary........................................................................................ 72
4.6 Flash and EEPROM registers descriptions.....................................................................................................................86
4.6.1 Flash Clock Divider Register (NVM_FCLKDIV)...........................................................................................86
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4.6.2 Flash Security Register (NVM_FSEC)............................................................................................................87
4.6.3 Flash CCOB Index Register (NVM_FCCOBIX)............................................................................................ 88
4.6.4 Flash Configuration Register (NVM_FCNFG)............................................................................................... 88
4.6.5 Flash Error Configuration Register (NVM_FERCNFG).................................................................................89
4.6.6 Flash Status Register (NVM_FSTAT).............................................................................................................90
4.6.7 Flash Error Status Register (NVM_FERSTAT).............................................................................................. 91
4.6.8 Flash Protection Register (NVM_FPROT)......................................................................................................92
4.6.9 EEPROM Protection Register (NVM_EEPROT)............................................................................................93
4.6.10 Flash Common Command Object Register:High (NVM_FCCOBHI)............................................................94
4.6.11 Flash Common Command Object Register: Low (NVM_FCCOBLO)...........................................................95
4.6.12 Flash Option Register (NVM_FOPT)..............................................................................................................95
Chapter 5
Interrupt
5.1 Interrupts.........................................................................................................................................................................97
5.1.1 Interrupt stack frame........................................................................................................................................ 98
5.1.2 Interrupt vectors, sources, and local masks......................................................................................................99
5.1.3 Hardware nested interrupt................................................................................................................................101
5.1.3.1 Interrupt priority level register.........................................................................................................103
5.1.3.2 Interrupt priority level comparator set............................................................................................. 104
5.1.3.3 Interrupt priority mask update and restore mechanism....................................................................104
5.1.3.4 Integration and application of the IPC............................................................................................. 105
5.2 IRQ..................................................................................................................................................................................105
5.2.1 Features............................................................................................................................................................ 106
5.2.1.1 Pin configuration options.................................................................................................................106
5.2.1.2 Edge and level sensitivity................................................................................................................ 107
5.3 Interrupt pin request register...........................................................................................................................................107
5.3.1 Interrupt Pin Request Status and Control Register (IRQ_SC).........................................................................108
5.4 Interrupt priority control register.................................................................................................................................... 109
5.4.1 IPC Status and Control Register (IPC_SC)......................................................................................................110
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5.4.2 Interrupt Priority Mask Pseudo Stack Register (IPC_IPMPS)........................................................................ 111
5.4.3
Interrupt Level Setting Registers n (IPC_ILRSn)............................................................................................111
Chapter 6
System control
6.1 System device identification (SDID)..............................................................................................................................113
6.2 Universally unique identification (UUID)......................................................................................................................113
6.3 Reset and system initialization........................................................................................................................................113
6.4 System options................................................................................................................................................................114
6.4.1 BKGD pin enable.............................................................................................................................................114
6.4.2 RESET pin enable............................................................................................................................................114
6.4.3 SCI0 pin reassignment..................................................................................................................................... 114
6.4.4 FTM0 channels pin reassignment.................................................................................................................... 115
6.4.5 FTM1 pin reassignment................................................................................................................................... 115
6.5 System interconnection...................................................................................................................................................115
6.5.1 ACMP output selection....................................................................................................................................115
6.5.2 SCI0 TxD modulation......................................................................................................................................116
6.5.3 SCI0 RxD capture............................................................................................................................................ 116
6.5.4 SCI0 RxD filter................................................................................................................................................ 117
6.5.5 RTC capture..................................................................................................................................................... 117
6.5.6 ADC hardware trigger......................................................................................................................................117
6.6 System Control Registers................................................................................................................................................118
6.6.1 System Reset Status Register (SYS_SRS).......................................................................................................119
6.6.2 System Background Debug Force Reset Register (SYS_SBDFR)..................................................................121
6.6.3 System Device Identification Register: High (SYS_SDIDH)......................................................................... 121
6.6.4 System Device Identification Register: Low (SYS_SDIDL).......................................................................... 122
6.6.5 System Options Register 1 (SYS_SOPT1)...................................................................................................... 122
6.6.6 System Options Register 2 (SYS_SOPT2)...................................................................................................... 124
6.6.7 System Options Register 3 (SYS_SOPT3)...................................................................................................... 125
6.6.8 Illegal Address Register: High (SYS_ILLAH)................................................................................................126
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6.6.9 Illegal Address Register: Low (SYS_ILLAL).................................................................................................126
6.6.10 Universally Unique Identifier Register 1 (SYS_UUID1)................................................................................127
6.6.11 Universally Unique Identifier Register 2 (SYS_UUID2)................................................................................127
6.6.12 Universally Unique Identifier Register 3 (SYS_UUID3)................................................................................128
6.6.13 Universally Unique Identifier Register 4 (SYS_UUID4)................................................................................128
6.6.14 Universally Unique Identifier Register 5 (SYS_UUID5)................................................................................129
6.6.15 Universally Unique Identifier Register 6 (SYS_UUID6)................................................................................129
6.6.16 Universally Unique Identifier Register 7 (SYS_UUID7)................................................................................130
6.6.17 Universally Unique Identifier Register 8 (SYS_UUID8)................................................................................130
Chapter 7
Parallel input/output
7.1 Introduction.....................................................................................................................................................................131
7.2 Port data and data direction.............................................................................................................................................133
7.3 Internal pullup enable..................................................................................................................................................... 133
7.4 Input glitch filter setting..................................................................................................................................................134
7.5 High current drive...........................................................................................................................................................134
7.6 Pin behavior in stop mode...............................................................................................................................................134
7.7 Port data registers............................................................................................................................................................134
7.7.1 Port A Data Register (PORT_PTAD)..............................................................................................................135
7.7.2 Port B Data Register (PORT_PTBD).............................................................................................................. 136
7.7.3 Port C Data Register (PORT_PTCD).............................................................................................................. 136
7.7.4 Port High Drive Enable Register (PORT_HDRVE)........................................................................................137
7.7.5 Port A Output Enable Register (PORT_PTAOE)............................................................................................137
7.7.6 Port B Output Enable Register (PORT_PTBOE)............................................................................................ 138
7.7.7 Port C Output Enable Register (PORT_PTCOE)............................................................................................ 139
7.7.8 Port A Input Enable Register (PORT_PTAIE)................................................................................................140
7.7.9 Port B Input Enable Register (PORT_PTBIE)................................................................................................ 141
7.7.10 Port C Input Enable Register (PORT_PTCIE)................................................................................................ 142
7.7.11 Port Filter Register 0 (PORT_IOFLT0)...........................................................................................................143
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7.7.12 Port Filter Register 2 (PORT_IOFLT2)...........................................................................................................144
7.7.13 Port Clock Division Register (PORT_FCLKDIV).......................................................................................... 145
7.7.14 Port A Pullup Enable Register (PORT_PTAPE)............................................................................................. 146
7.7.15 Port B Pullup Enable Register (PORT_PTBPE)..............................................................................................147
7.7.16 Port C Pullup Enable Register (PORT_PTCPE)..............................................................................................148
Chapter 8
Clock management
8.1 Clock module..................................................................................................................................................................151
8.2 Internal clock source (ICS)............................................................................................................................................. 152
8.2.1 Function description.........................................................................................................................................153
8.2.1.1 Bus frequency divider...................................................................................................................... 154
8.2.1.2 Low power bit usage........................................................................................................................154
8.2.1.3 Internal reference clock (ICSIRCLK)..............................................................................................154
8.2.1.4 Fixed frequency clock (ICSFFCLK)................................................................................................155
8.2.1.5 BDC clock........................................................................................................................................156
8.2.2 Modes of operation.......................................................................................................................................... 156
8.2.2.1 FLL engaged internal (FEI)............................................................................................................. 157
8.2.2.2 FLL engaged external (FEE)............................................................................................................158
8.2.2.3 FLL bypassed internal (FBI)............................................................................................................158
8.2.2.4 FLL bypassed internal low power (FBILP)..................................................................................... 158
8.2.2.5 FLL bypassed external (FBE)..........................................................................................................159
8.2.2.6 FLL bypassed external low power (FBELP)................................................................................... 159
8.2.2.7 Stop (STOP).....................................................................................................................................160
8.2.3 FLL lock and clock monitor.............................................................................................................................161
8.2.3.1 FLL clock lock.................................................................................................................................161
8.2.3.2 External reference clock monitor.....................................................................................................161
8.3 Initialization / application information........................................................................................................................... 161
8.3.1 Initializing FEI mode....................................................................................................................................... 162
8.3.2 Initializing FBI mode.......................................................................................................................................162
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8.3.3 Initializing FEE mode...................................................................................................................................... 162
8.3.4 Initializing FBE mode......................................................................................................................................163
8.3.5 External oscillator (OSC).................................................................................................................................163
8.3.5.1 Bypass mode.................................................................................................................................... 164
8.3.5.2 Low-power configuration................................................................................................................ 164
8.3.5.3 High-gain configuration...................................................................................................................165
8.3.5.4 Initializing external oscillator for peripherals..................................................................................165
8.4 1 kHz low-power oscillator (LPO)................................................................................................................................. 166
8.5 Peripheral clock gating................................................................................................................................................... 166
8.6 ICS control registers....................................................................................................................................................... 166
8.6.1 ICS Control Register 1 (ICS_C1).................................................................................................................... 167
8.6.2 ICS Control Register 2 (ICS_C2).................................................................................................................... 168
8.6.3 ICS Control Register 3 (ICS_C3).................................................................................................................... 169
8.6.4 ICS Control Register 4 (ICS_C4).................................................................................................................... 169
8.6.5 ICS Status Register (ICS_S)............................................................................................................................ 170
8.6.6 OSC Status and Control Register (ICS_OSCSC)............................................................................................ 171
8.7 System clock gating control registers............................................................................................................................. 172
8.7.1 System Clock Gating Control 1 Register (SCG_C1).......................................................................................173
8.7.2 System Clock Gating Control 2 Register (SCG_C2).......................................................................................174
8.7.3 System Clock Gating Control 3 Register (SCG_C3).......................................................................................175
8.7.4 System Clock Gating Control 4 Register (SCG_C4).......................................................................................175
Chapter 9
Chip configurations
9.1 Introduction.....................................................................................................................................................................177
9.2 Core modules.................................................................................................................................................................. 177
9.2.1 Central processor unit (CPU)...........................................................................................................................177
9.2.2 Debug module (DBG)......................................................................................................................................177
9.3 System modules.............................................................................................................................................................. 178
9.3.1 Watchdog (WDOG)......................................................................................................................................... 178
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9.4 Clock module..................................................................................................................................................................178
9.5 Memory...........................................................................................................................................................................180
9.5.1 Random-access-memory (RAM)..................................................................................................................... 180
9.5.2 Non-volatile memory (NVM).......................................................................................................................... 180
9.6 Power modules................................................................................................................................................................180
9.7 Timers............................................................................................................................................................................. 181
9.7.1 FlexTimer module (FTM)................................................................................................................................181
9.7.1.1 FTM0 interconnection......................................................................................................................182
9.7.1.2 FTM1 interconnection......................................................................................................................183
9.7.2 Real-time counter (RTC)................................................................................................................................. 183
9.8 Communication interfaces.............................................................................................................................................. 185
9.8.1 Serial communications interface (SCI)............................................................................................................185
9.8.1.1 SCI0 infrared functions....................................................................................................................186
9.9 Analog.............................................................................................................................................................................187
9.9.1 Analog-to-digital converter (ADC)..................................................................................................................187
9.9.1.1 ADC channel assignments............................................................................................................... 188
9.9.1.2 Alternate clock................................................................................................................................. 189
9.9.1.3 Hardware trigger.............................................................................................................................. 190
9.9.1.4 Temperature sensor..........................................................................................................................190
9.9.2 Analog comparator (ACMP)............................................................................................................................191
9.9.2.1 ACMP configuration information....................................................................................................192
9.9.2.2 ACMP in stop3 mode.......................................................................................................................193
9.9.2.3 ACMP to FTM configuration information.......................................................................................193
9.9.2.4 ACMP for SCI0 RXD filter............................................................................................................. 193
9.10 Human-machine interfaces HMI.....................................................................................................................................194
9.10.1 Keyboard interrupts (KBI)...............................................................................................................................194
Chapter 10
Central processor unit
10.1 Introduction.....................................................................................................................................................................197
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10.1.1 Features............................................................................................................................................................ 197
10.2 Programmer's Model and CPU Registers....................................................................................................................... 198
10.2.1 Accumulator (A).............................................................................................................................................. 198
10.2.2 Index Register (H:X)........................................................................................................................................199
10.2.3 Stack Pointer (SP)............................................................................................................................................ 199
10.2.4 Program Counter (PC)..................................................................................................................................... 200
10.2.5 Condition Code Register (CCR)...................................................................................................................... 200
10.3 Addressing Modes.......................................................................................................................................................... 201
10.3.1 Inherent Addressing Mode (INH)....................................................................................................................202
10.3.2 Relative Addressing Mode (REL)....................................................................................................................202
10.3.3 Immediate Addressing Mode (IMM)...............................................................................................................202
10.3.4 Direct Addressing Mode (DIR)........................................................................................................................203
10.3.5 Extended Addressing Mode (EXT)..................................................................................................................203
10.3.6 Indexed Addressing Mode............................................................................................................................... 204
10.3.6.1 Indexed, No Offset (IX)...................................................................................................................204
10.3.6.2 Indexed, No Offset with Post Increment (IX+)................................................................................204
10.3.6.3 Indexed, 8-Bit Offset (IX1)..............................................................................................................204
10.3.6.4 Indexed, 8-Bit Offset with Post Increment (IX1+).......................................................................... 205
10.3.6.5 Indexed, 16-Bit Offset (IX2)............................................................................................................205
10.3.6.6 SP-Relative, 8-Bit Offset (SP1)....................................................................................................... 205
10.3.6.7 SP-Relative, 16-Bit Offset (SP2)..................................................................................................... 206
10.3.7 Memory to memory Addressing Mode............................................................................................................206
10.3.7.1 Direct to Direct.................................................................................................................................206
10.3.7.2 Immediate to Direct......................................................................................................................... 206
10.3.7.3 Indexed to Direct, Post Increment....................................................................................................206
10.3.7.4 Direct to Indexed, Post-Increment................................................................................................... 207
10.4 Operation modes............................................................................................................................................................. 207
10.4.1 Stop mode........................................................................................................................................................ 207
10.4.2 Wait mode........................................................................................................................................................207
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10.4.3 Background mode............................................................................................................................................ 208
10.4.4 Security mode.................................................................................................................................................. 209
10.5 HCS08 V6 Opcodes........................................................................................................................................................211
10.6 Special Operations.......................................................................................................................................................... 211
10.6.1 Reset Sequence................................................................................................................................................ 211
10.6.2 Interrupt Sequence........................................................................................................................................... 211
10.7 Instruction Set Summary.................................................................................................................................................212
Chapter 11
Keyboard Interrupts (KBI)
11.1 Introduction.....................................................................................................................................................................225
11.1.1 Features............................................................................................................................................................ 225
11.1.2 Modes of Operation......................................................................................................................................... 225
11.1.2.1 KBI in Wait mode............................................................................................................................225
11.1.2.2 KBI in Stop modes...........................................................................................................................226
11.1.2.3 KBI in Active Background mode.....................................................................................................226
11.1.3 Block Diagram................................................................................................................................................. 226
11.2 External signals description............................................................................................................................................ 227
11.3 Register definition...........................................................................................................................................................227
11.4 Memory Map and Registers............................................................................................................................................227
11.4.1
KBI Status and Control Register (KBIx_SC).................................................................................................. 228
11.4.2
KBIx Pin Enable Register (KBIx_PE).............................................................................................................228
11.4.3
KBIx Edge Select Register (KBIx_ES)........................................................................................................... 229
11.5 Functional Description....................................................................................................................................................229
11.5.1 Edge-only sensitivity........................................................................................................................................230
11.5.2 Edge and level sensitivity................................................................................................................................ 230
11.5.3 KBI Pullup Resistor......................................................................................................................................... 230
11.5.4 KBI initialization..............................................................................................................................................230
Chapter 12
FlexTimer Module (FTM)
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12.1 Introduction.....................................................................................................................................................................233
12.1.1 FlexTimer philosophy......................................................................................................................................233
12.1.2 Features............................................................................................................................................................ 233
12.1.3 Modes of operation.......................................................................................................................................... 234
12.1.4 Block diagram..................................................................................................................................................234
12.2 Signal description............................................................................................................................................................235
12.2.1 EXTCLK — FTM external clock.................................................................................................................... 236
12.2.2 CHn — FTM channel (n) I/O pin.................................................................................................................... 236
12.3 Memory map and register definition...............................................................................................................................236
12.3.1 Module memory map.......................................................................................................................................236
12.3.2 Register descriptions........................................................................................................................................236
12.3.3
Status and Control (FTMx_SC)....................................................................................................................... 238
12.3.4
Counter High (FTMx_CNTH)......................................................................................................................... 239
12.3.5
Counter Low (FTMx_CNTL).......................................................................................................................... 240
12.3.6
Modulo High (FTMx_MODH)........................................................................................................................ 240
12.3.7
Modulo Low (FTMx_MODL)......................................................................................................................... 241
12.3.8
Channel Status and Control (FTMx_CnSC).................................................................................................... 241
12.3.9
Channel Value High (FTMx_CnVH)...............................................................................................................243
12.3.10
Channel Value Low (FTMx_CnVL)................................................................................................................244
12.4 Functional Description....................................................................................................................................................244
12.4.1 Clock Source....................................................................................................................................................245
12.4.1.1 Counter Clock Source...................................................................................................................... 245
12.4.2 Prescaler...........................................................................................................................................................246
12.4.3 Counter.............................................................................................................................................................246
12.4.3.1 Up counting......................................................................................................................................246
12.4.3.2 Up-down counting............................................................................................................................247
12.4.3.3 Free running counter........................................................................................................................ 248
12.4.3.4 Counter reset.................................................................................................................................... 248
12.4.4 Input capture mode...........................................................................................................................................248
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12.4.5 Output compare mode......................................................................................................................................249
12.4.6 Edge-aligned PWM (EPWM) mode................................................................................................................ 251
12.4.7 Center-aligned PWM (CPWM) mode..............................................................................................................252
12.4.8 Update of the registers with write buffers........................................................................................................254
12.4.8.1 MODH:L registers........................................................................................................................... 254
12.4.8.2 CnVH:L registers............................................................................................................................. 255
12.4.9 BDM mode.......................................................................................................................................................255
12.5 Reset overview................................................................................................................................................................255
12.6 FTM Interrupts................................................................................................................................................................257
12.6.1 Timer overflow interrupt..................................................................................................................................257
12.6.2 Channel (n) interrupt........................................................................................................................................257
Chapter 13
Real-time counter (RTC)
13.1 Introduction.....................................................................................................................................................................259
13.2 Features...........................................................................................................................................................................259
13.2.1 Modes of operation.......................................................................................................................................... 259
13.2.1.1 Wait mode........................................................................................................................................259
13.2.1.2 Stop modes.......................................................................................................................................260
13.2.2 Block diagram..................................................................................................................................................260
13.3 Register definition...........................................................................................................................................................260
13.3.1 RTC Status and Control Register 1 (RTC_SC1)............................................................................................. 261
13.3.2 RTC Status and Control Register 2 (RTC_SC2)............................................................................................. 262
13.3.3 RTC Modulo Register: High (RTC_MODH).................................................................................................. 263
13.3.4 RTC Modulo Register: Low (RTC_MODL)................................................................................................... 263
13.3.5 RTC Counter Register: High (RTC_CNTH)................................................................................................... 263
13.3.6 RTC Counter Register: Low (RTC_CNTL).................................................................................................... 264
13.4 Functional description.....................................................................................................................................................264
13.4.1 RTC operation example................................................................................................................................... 265
13.5 Initialization/application information............................................................................................................................. 266
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Chapter 14
Serial communications interface (SCI)
14.1 Introduction.....................................................................................................................................................................269
14.1.1 Features............................................................................................................................................................ 269
14.1.2 Modes of operation.......................................................................................................................................... 269
14.1.3 Block diagram..................................................................................................................................................270
14.2 SCI signal descriptions................................................................................................................................................... 272
14.2.1 Detailed signal descriptions............................................................................................................................. 272
14.3 Register definition...........................................................................................................................................................272
14.3.1
SCI Baud Rate Register: High (SCIx_BDH)................................................................................................... 273
14.3.2
SCI Baud Rate Register: Low (SCIx_BDL).................................................................................................... 274
14.3.3
SCI Control Register 1 (SCIx_C1)...................................................................................................................274
14.3.4
SCI Control Register 2 (SCIx_C2)...................................................................................................................276
14.3.5
SCI Status Register 1 (SCIx_S1)..................................................................................................................... 277
14.3.6
SCI Status Register 2 (SCIx_S2)..................................................................................................................... 279
14.3.7
SCI Control Register 3 (SCIx_C3)...................................................................................................................280
14.3.8
SCI Data Register (SCIx_D)............................................................................................................................282
14.4 Functional description.....................................................................................................................................................282
14.4.1 Baud rate generation........................................................................................................................................ 283
14.4.2 Transmitter functional description...................................................................................................................283
14.4.2.1 Send break and queued idle............................................................................................................. 284
14.4.3 Receiver functional description....................................................................................................................... 285
14.4.3.1 Data sampling technique..................................................................................................................286
14.4.3.2 Receiver wake-up operation.............................................................................................................287
14.4.4 Interrupts and status flags................................................................................................................................ 288
14.4.5 Baud rate tolerance...........................................................................................................................................289
14.4.5.1 Slow data tolerance.......................................................................................................................... 289
14.4.5.2 Fast data tolerance............................................................................................................................291
14.4.6 Additional SCI functions................................................................................................................................. 292
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14.4.6.1 8- and 9-bit data modes....................................................................................................................292
14.4.6.2 Stop mode operation........................................................................................................................ 292
14.4.6.3 Loop mode....................................................................................................................................... 292
14.4.6.4 Single-wire operation.......................................................................................................................293
Chapter 15
Analog-to-digital converter (ADC)
15.1 Introduction.....................................................................................................................................................................295
15.1.1 Features............................................................................................................................................................ 295
15.1.2 Block Diagram................................................................................................................................................. 296
15.2 External Signal Description............................................................................................................................................ 296
15.2.1 Analog Power (VDDA)................................................................................................................................... 297
15.2.2 Analog Ground (VSSA)...................................................................................................................................297
15.2.3 Voltage Reference High (VREFH)..................................................................................................................297
15.2.4 Voltage Reference Low (VREFL)................................................................................................................... 297
15.2.5 Analog Channel Inputs (ADx)......................................................................................................................... 297
15.3 ADC Control Registers...................................................................................................................................................298
15.3.1 Status and Control Register 1 (ADC_SC1)......................................................................................................298
15.3.2 Status and Control Register 2 (ADC_SC2)......................................................................................................300
15.3.3 Status and Control Register 3 (ADC_SC3)......................................................................................................301
15.3.4 Status and Control Register 4 (ADC_SC4)......................................................................................................302
15.3.5 Conversion Result High Register (ADC_RH).................................................................................................303
15.3.6 Conversion Result Low Register (ADC_RL).................................................................................................. 304
15.3.7 Compare Value High Register (ADC_CVH)...................................................................................................305
15.3.8 Compare Value Low Register (ADC_CVL)....................................................................................................305
15.3.9 Pin Control 1 Register (ADC_APCTL1).........................................................................................................306
15.4 Functional description.....................................................................................................................................................307
15.4.1 Clock select and divide control........................................................................................................................307
15.4.2 Input select and pin control..............................................................................................................................308
15.4.3 Hardware trigger.............................................................................................................................................. 308
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16 NXP Semiconductors
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15.4.4 Conversion control...........................................................................................................................................309
15.4.4.1 Initiating conversions.......................................................................................................................309
15.4.4.2 Completing conversions...................................................................................................................309
15.4.4.3 Aborting conversions....................................................................................................................... 310
15.4.4.4 Power control................................................................................................................................... 311
15.4.4.5 Sample time and total conversion time............................................................................................311
15.4.5 Automatic compare function............................................................................................................................312
15.4.6 FIFO operation.................................................................................................................................................313
15.4.7 MCU wait mode operation...............................................................................................................................316
15.4.8 MCU Stop3 mode operation............................................................................................................................ 317
15.4.8.1 Stop3 mode with ADACK disabled.................................................................................................317
15.4.8.2 Stop3 mode with ADACK enabled..................................................................................................317
15.5 Initialization information................................................................................................................................................ 318
15.5.1 ADC module initialization example................................................................................................................ 318
15.5.1.1 Initialization sequence......................................................................................................................318
15.5.1.2 Pseudo-code example.......................................................................................................................319
15.5.2 ADC FIFO module initialization example.......................................................................................................319
15.5.2.1 Pseudo-code example.......................................................................................................................320
15.6 Application information..................................................................................................................................................321
15.6.1 External pins and routing................................................................................................................................. 321
15.6.1.1 Analog supply pins...........................................................................................................................321
15.6.1.2 Analog reference pins...................................................................................................................... 321
15.6.1.3 Analog input pins.............................................................................................................................322
15.6.2 Sources of error................................................................................................................................................323
15.6.2.1 Sampling error..................................................................................................................................323
15.6.2.2 Pin leakage error.............................................................................................................................. 323
15.6.2.3 Noise-induced errors........................................................................................................................323
15.6.2.4 Code width and quantization error...................................................................................................324
15.6.2.5 Linearity errors.................................................................................................................................325
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Section number Title Page
15.6.2.6 Code jitter, non-monotonicity, and missing codes...........................................................................326
Chapter 16
Analog comparator (ACMP)
16.1 Introduction.....................................................................................................................................................................327
16.1.1 Features............................................................................................................................................................ 327
16.1.2 Modes of operation.......................................................................................................................................... 327
16.1.2.1 Operation in Wait mode...................................................................................................................328
16.1.2.2 Operation in Stop3 mode................................................................................................................. 328
16.1.2.3 Operation in Debug mode................................................................................................................328
16.1.3 Block diagram..................................................................................................................................................328
16.2 External signal description..............................................................................................................................................329
16.3 Memory map and register definition...............................................................................................................................329
16.3.1 ACMP Control and Status Register (ACMP_CS)........................................................................................... 330
16.3.2 ACMP Control Register 0 (ACMP_C0).......................................................................................................... 331
16.3.3 ACMP Control Register 1 (ACMP_C1).......................................................................................................... 331
16.3.4 ACMP Control Register 2 (ACMP_C2).......................................................................................................... 332
16.4 Functional description.....................................................................................................................................................332
16.5 Setup and operation of ACMP........................................................................................................................................333
16.6 Resets..............................................................................................................................................................................334
16.7 Interrupts.........................................................................................................................................................................334
Chapter 17
Watchdog (WDOG)
17.1 Introduction.....................................................................................................................................................................335
17.1.1 Features............................................................................................................................................................ 335
17.1.2 Block diagram..................................................................................................................................................336
17.2 Memory map and register definition...............................................................................................................................337
17.2.1 Watchdog Control and Status Register 1 (WDOG_CS1)................................................................................ 337
17.2.2 Watchdog Control and Status Register 2 (WDOG_CS2)................................................................................ 339
17.2.3 Watchdog Counter Register: High (WDOG_CNTH)......................................................................................340
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Section number Title Page
17.2.4 Watchdog Counter Register: Low (WDOG_CNTL).......................................................................................340
17.2.5 Watchdog Timeout Value Register: High (WDOG_TOVALH)..................................................................... 341
17.2.6 Watchdog Timeout Value Register: Low (WDOG_TOVALL)...................................................................... 341
17.2.7 Watchdog Window Register: High (WDOG_WINH).....................................................................................342
17.2.8 Watchdog Window Register: Low (WDOG_WINL)...................................................................................... 342
17.3 Functional description.....................................................................................................................................................343
17.3.1 Watchdog refresh mechanism..........................................................................................................................343
17.3.1.1 Window mode..................................................................................................................................344
17.3.1.2 Refreshing the Watchdog.................................................................................................................344
17.3.1.3 Example code: Refreshing the Watchdog........................................................................................345
17.3.2 Configuring the Watchdog...............................................................................................................................345
17.3.2.1 Reconfiguring the Watchdog........................................................................................................... 345
17.3.2.2 Unlocking the Watchdog................................................................................................................. 346
17.3.2.3 Example code: Reconfiguring the Watchdog.................................................................................. 346
17.3.3 Clock source.....................................................................................................................................................346
17.3.4 Using interrupts to delay resets........................................................................................................................348
17.3.5 Backup reset.....................................................................................................................................................348
17.3.6 Functionality in debug and low-power modes.................................................................................................348
17.3.7 Fast testing of the watchdog.............................................................................................................................349
17.3.7.1 Testing each byte of the counter...................................................................................................... 349
17.3.7.2 Entering user mode.......................................................................................................................... 350
Chapter 18
Development support
18.1 Introduction.....................................................................................................................................................................351
18.1.1 Forcing active background...............................................................................................................................351
18.1.2 Features............................................................................................................................................................ 351
18.2 Background debug controller (BDC)..............................................................................................................................352
18.2.1 BKGD pin description..................................................................................................................................... 353
18.2.2 Communication details.................................................................................................................................... 354
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Section number Title Page
18.2.3 BDC commands............................................................................................................................................... 356
18.2.4 BDC hardware breakpoint............................................................................................................................... 359
18.3 On-chip debug system (DBG)........................................................................................................................................ 359
18.3.1 Comparators A and B.......................................................................................................................................360
18.3.2 Bus capture information and FIFO operation.................................................................................................. 360
18.3.3 Change-of-flow information............................................................................................................................ 361
18.3.4 Tag vs. force breakpoints and triggers.............................................................................................................362
18.3.5 Trigger modes.................................................................................................................................................. 363
18.3.6 Hardware breakpoints...................................................................................................................................... 364
18.4 Memory map and register description............................................................................................................................ 365
18.4.1 BDC Status and Control Register (BDC_SCR)...............................................................................................365
18.4.2 BDC Breakpoint Match Register: High (BDC_BKPTH)................................................................................367
18.4.3 BDC Breakpoint Register: Low (BDC_BKPTL)............................................................................................ 368
18.4.4 System Background Debug Force Reset Register (BDC_SBDFR).................................................................368
Chapter 19
Debug module (DBG)
19.1 Introduction.....................................................................................................................................................................371
19.1.1 Features............................................................................................................................................................ 371
19.1.2 Modes of operation.......................................................................................................................................... 372
19.1.3 Block diagram..................................................................................................................................................372
19.2 Signal description............................................................................................................................................................373
19.3 Memory map and registers..............................................................................................................................................373
19.3.1 Debug Comparator A High Register (DBG_CAH)......................................................................................... 374
19.3.2 Debug Comparator A Low Register (DBG_CAL).......................................................................................... 375
19.3.3 Debug Comparator B High Register (DBG_CBH)..........................................................................................376
19.3.4 Debug Comparator B Low Register (DBG_CBL)...........................................................................................376
19.3.5 Debug Comparator C High Register (DBG_CCH)..........................................................................................377
19.3.6 Debug Comparator C Low Register (DBG_CCL)...........................................................................................378
19.3.7 Debug FIFO High Register (DBG_FH)...........................................................................................................378
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20 NXP Semiconductors
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