NXP K40_72 Reference guide

Type
Reference guide
K40 Sub-Family Reference Manual
Supports: MK40DX64VLH7, MK40DX128VLH7, MK40DX256VLH7
Document Number: K40P64M72SF1RM
Rev. 1.1, Dec 2012
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2 Freescale Semiconductor, Inc.
Contents
Section number Title Page
Chapter 1
About This Document
1.1 Overview.......................................................................................................................................................................51
1.1.1 Purpose...........................................................................................................................................................51
1.1.2 Audience........................................................................................................................................................51
1.2 Conventions..................................................................................................................................................................51
1.2.1 Numbering systems........................................................................................................................................51
1.2.2 Typographic notation.....................................................................................................................................52
1.2.3 Special terms..................................................................................................................................................52
Chapter 2
Introduction
2.1 Overview.......................................................................................................................................................................53
2.2 Module Functional Categories......................................................................................................................................53
2.2.1 ARM Cortex-M4 Core Modules....................................................................................................................54
2.2.2 System Modules.............................................................................................................................................55
2.2.3 Memories and Memory Interfaces.................................................................................................................56
2.2.4 Clocks.............................................................................................................................................................56
2.2.5 Security and Integrity modules......................................................................................................................57
2.2.6 Analog modules.............................................................................................................................................57
2.2.7 Timer modules...............................................................................................................................................58
2.2.8 Communication interfaces.............................................................................................................................59
2.2.9 Human-machine interfaces............................................................................................................................59
2.3 Orderable part numbers.................................................................................................................................................60
Chapter 3
Chip Configuration
3.1 Introduction...................................................................................................................................................................61
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3.2 Core modules................................................................................................................................................................61
3.2.1 ARM Cortex-M4 Core Configuration............................................................................................................61
3.2.2 Nested Vectored Interrupt Controller (NVIC) Configuration........................................................................63
3.2.3 Asynchronous Wake-up Interrupt Controller (AWIC) Configuration...........................................................69
3.2.4 JTAG Controller Configuration.....................................................................................................................71
3.3 System modules............................................................................................................................................................71
3.3.1 SIM Configuration.........................................................................................................................................71
3.3.2 System Mode Controller (SMC) Configuration.............................................................................................72
3.3.3 PMC Configuration........................................................................................................................................73
3.3.4 Low-Leakage Wake-up Unit (LLWU) Configuration...................................................................................73
3.3.5 MCM Configuration......................................................................................................................................75
3.3.6 Crossbar Switch Configuration......................................................................................................................76
3.3.7 Peripheral Bridge Configuration....................................................................................................................77
3.3.8 DMA request multiplexer configuration........................................................................................................78
3.3.9 DMA Controller Configuration.....................................................................................................................81
3.3.10 External Watchdog Monitor (EWM) Configuration......................................................................................82
3.3.11 Watchdog Configuration................................................................................................................................84
3.4 Clock modules..............................................................................................................................................................85
3.4.1 MCG Configuration.......................................................................................................................................85
3.4.2 OSC Configuration........................................................................................................................................86
3.4.3 RTC OSC configuration.................................................................................................................................87
3.5 Memories and memory interfaces.................................................................................................................................87
3.5.1 Flash Memory Configuration.........................................................................................................................87
3.5.2 Flash Memory Controller Configuration.......................................................................................................90
3.5.3 SRAM Configuration.....................................................................................................................................91
3.5.4 SRAM Controller Configuration...................................................................................................................94
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3.5.5 System Register File Configuration...............................................................................................................95
3.5.6 VBAT Register File Configuration................................................................................................................96
3.5.7 EzPort Configuration.....................................................................................................................................96
3.6 Security.........................................................................................................................................................................98
3.6.1 CRC Configuration........................................................................................................................................98
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3.7 Analog...........................................................................................................................................................................98
3.7.1 16-bit SAR ADC with PGA Configuration...................................................................................................98
3.7.2 CMP Configuration........................................................................................................................................106
3.7.3 12-bit DAC Configuration.............................................................................................................................108
3.7.4 VREF Configuration......................................................................................................................................109
3.8 Timers...........................................................................................................................................................................110
3.8.1 PDB Configuration........................................................................................................................................110
3.8.2 FlexTimer Configuration...............................................................................................................................113
3.8.3 PIT Configuration..........................................................................................................................................117
3.8.4 Low-power timer configuration.....................................................................................................................118
3.8.5 CMT Configuration........................................................................................................................................120
3.8.6 RTC configuration.........................................................................................................................................121
3.9 Communication interfaces............................................................................................................................................122
3.9.1 Universal Serial Bus (USB) FS Subsystem...................................................................................................122
3.9.2 CAN Configuration........................................................................................................................................127
3.9.3 SPI configuration...........................................................................................................................................129
3.9.4 I2C Configuration..........................................................................................................................................133
3.9.5 UART Configuration.....................................................................................................................................133
3.9.6 I2S configuration............................................................................................................................................136
3.10 Human-machine interfaces...........................................................................................................................................139
3.10.1 GPIO configuration........................................................................................................................................139
3.10.2 TSI Configuration..........................................................................................................................................140
3.10.3 Segment LCD Configuration.........................................................................................................................142
Chapter 4
Memory Map
4.1 Introduction...................................................................................................................................................................145
4.2 System memory map.....................................................................................................................................................145
4.2.1 Aliased bit-band regions................................................................................................................................146
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4.3 Flash Memory Map.......................................................................................................................................................147
4.3.1 Alternate Non-Volatile IRC User Trim Description......................................................................................148
4.4 SRAM memory map.....................................................................................................................................................148
4.5 Peripheral bridge (AIPS-Lite0 and AIPS-Lite1) memory maps...................................................................................149
4.5.1 Peripheral Bridge 0 (AIPS-Lite 0) Memory Map..........................................................................................149
4.5.2 Peripheral Bridge 1 (AIPS-Lite 1) Memory Map..........................................................................................153
4.6 Private Peripheral Bus (PPB) memory map..................................................................................................................156
Chapter 5
Clock Distribution
5.1 Introduction...................................................................................................................................................................159
5.2 Programming model......................................................................................................................................................159
5.3 High-Level device clocking diagram............................................................................................................................159
5.4 Clock definitions...........................................................................................................................................................160
5.4.1 Device clock summary...................................................................................................................................161
5.5 Internal clocking requirements.....................................................................................................................................162
5.5.1 Clock divider values after reset......................................................................................................................163
5.5.2 VLPR mode clocking.....................................................................................................................................164
5.6 Clock Gating.................................................................................................................................................................164
5.7 Module clocks...............................................................................................................................................................164
5.7.1 PMC 1-kHz LPO clock..................................................................................................................................166
5.7.2 WDOG clocking............................................................................................................................................166
5.7.3 Debug trace clock...........................................................................................................................................166
5.7.4 PORT digital filter clocking...........................................................................................................................167
5.7.5 LPTMR clocking............................................................................................................................................167
5.7.6 USB FS OTG Controller clocking.................................................................................................................168
5.7.7 FlexCAN clocking.........................................................................................................................................169
5.7.8 UART clocking..............................................................................................................................................169
5.7.9 I2S/SAI clocking............................................................................................................................................169
5.7.10 TSI clocking...................................................................................................................................................170
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Chapter 6
Reset and Boot
6.1 Introduction...................................................................................................................................................................173
6.2 Reset..............................................................................................................................................................................174
6.2.1 Power-on reset (POR)....................................................................................................................................174
6.2.2 System reset sources......................................................................................................................................174
6.2.3 MCU Resets...................................................................................................................................................178
6.2.4 Reset Pin .......................................................................................................................................................180
6.2.5 Debug resets...................................................................................................................................................180
6.3 Boot...............................................................................................................................................................................181
6.3.1 Boot sources...................................................................................................................................................181
6.3.2 Boot options...................................................................................................................................................181
6.3.3 FOPT boot options.........................................................................................................................................182
6.3.4 Boot sequence................................................................................................................................................183
Chapter 7
Power Management
7.1 Introduction...................................................................................................................................................................185
7.2 Power modes.................................................................................................................................................................185
7.3 Entering and exiting power modes...............................................................................................................................187
7.4 Power mode transitions.................................................................................................................................................188
7.5 Power modes shutdown sequencing.............................................................................................................................189
7.6 Module Operation in Low Power Modes......................................................................................................................189
7.7 Clock Gating.................................................................................................................................................................192
Chapter 8
Security
8.1 Introduction...................................................................................................................................................................193
8.2 Flash Security...............................................................................................................................................................193
8.3 Security Interactions with other Modules.....................................................................................................................194
8.3.1 Security Interactions with EzPort..................................................................................................................194
8.3.2 Security Interactions with Debug...................................................................................................................194
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Chapter 9
Debug
9.1 Introduction...................................................................................................................................................................195
9.1.1 References......................................................................................................................................................197
9.2 The Debug Port.............................................................................................................................................................197
9.2.1 JTAG-to-SWD change sequence...................................................................................................................198
9.2.2 JTAG-to-cJTAG change sequence.................................................................................................................198
9.3 Debug Port Pin Descriptions.........................................................................................................................................199
9.4 System TAP connection................................................................................................................................................199
9.4.1 IR Codes.........................................................................................................................................................199
9.5 JTAG status and control registers.................................................................................................................................200
9.5.1 MDM-AP Control Register............................................................................................................................201
9.5.2 MDM-AP Status Register..............................................................................................................................203
9.6 Debug Resets................................................................................................................................................................204
9.7 AHB-AP........................................................................................................................................................................205
9.8 ITM...............................................................................................................................................................................206
9.9 Core Trace Connectivity...............................................................................................................................................206
9.10 TPIU..............................................................................................................................................................................206
9.11 DWT.............................................................................................................................................................................206
9.12 Debug in Low Power Modes........................................................................................................................................207
9.12.1 Debug Module State in Low Power Modes...................................................................................................208
9.13 Debug & Security.........................................................................................................................................................208
Chapter 10
Signal Multiplexing and Signal Descriptions
10.1 Introduction...................................................................................................................................................................209
10.2 Signal Multiplexing Integration....................................................................................................................................209
10.2.1 Port control and interrupt module features....................................................................................................210
10.2.2 PCRn reset values for port A.........................................................................................................................210
10.2.3 Clock gating...................................................................................................................................................210
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10.2.4 Signal multiplexing constraints......................................................................................................................210
10.3 Pinout............................................................................................................................................................................211
10.3.1 K40 Signal Multiplexing and Pin Assignments.............................................................................................211
10.3.2 K40 Pinouts....................................................................................................................................................214
10.4 Module Signal Description Tables................................................................................................................................215
10.4.1 Core Modules.................................................................................................................................................216
10.4.2 System Modules.............................................................................................................................................216
10.4.3 Clock Modules...............................................................................................................................................217
10.4.4 Memories and Memory Interfaces.................................................................................................................217
10.4.5 Analog............................................................................................................................................................218
10.4.6 Timer Modules...............................................................................................................................................219
10.4.7 Communication Interfaces.............................................................................................................................221
10.4.8 Human-Machine Interfaces (HMI)................................................................................................................223
Chapter 11
Port control and interrupts (PORT)
11.1 Introduction...................................................................................................................................................................225
11.1.1 Overview........................................................................................................................................................225
11.1.2 External signal description.............................................................................................................................226
11.1.3 Detailed signal description.............................................................................................................................227
11.1.4 Memory map and register definition..............................................................................................................227
11.1.5 Functional description....................................................................................................................................237
Chapter 12
System Integration Module (SIM)
12.1 Introduction...................................................................................................................................................................241
12.1.1 Features..........................................................................................................................................................241
12.2 Memory map and register definition.............................................................................................................................242
12.2.1 System Options Register 1 (SIM_SOPT1)....................................................................................................243
12.2.2 SOPT1 Configuration Register (SIM_SOPT1CFG)......................................................................................245
12.2.3 System Options Register 2 (SIM_SOPT2)....................................................................................................246
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12.2.4 System Options Register 4 (SIM_SOPT4)....................................................................................................248
12.2.5 System Options Register 5 (SIM_SOPT5)....................................................................................................251
12.2.6 System Options Register 7 (SIM_SOPT7)....................................................................................................252
12.2.7 System Device Identification Register (SIM_SDID).....................................................................................254
12.2.8 System Clock Gating Control Register 1 (SIM_SCGC1)..............................................................................255
12.2.9 System Clock Gating Control Register 2 (SIM_SCGC2)..............................................................................256
12.2.10 System Clock Gating Control Register 3 (SIM_SCGC3)..............................................................................257
12.2.11 System Clock Gating Control Register 4 (SIM_SCGC4)..............................................................................258
12.2.12 System Clock Gating Control Register 5 (SIM_SCGC5)..............................................................................260
12.2.13 System Clock Gating Control Register 6 (SIM_SCGC6)..............................................................................262
12.2.14 System Clock Gating Control Register 7 (SIM_SCGC7)..............................................................................265
12.2.15 System Clock Divider Register 1 (SIM_CLKDIV1).....................................................................................265
12.2.16 System Clock Divider Register 2 (SIM_CLKDIV2).....................................................................................267
12.2.17 Flash Configuration Register 1 (SIM_FCFG1).............................................................................................268
12.2.18 Flash Configuration Register 2 (SIM_FCFG2).............................................................................................270
12.2.19 Unique Identification Register High (SIM_UIDH).......................................................................................271
12.2.20 Unique Identification Register Mid-High (SIM_UIDMH)............................................................................272
12.2.21 Unique Identification Register Mid Low (SIM_UIDML).............................................................................272
12.2.22 Unique Identification Register Low (SIM_UIDL)........................................................................................273
12.3 Functional description...................................................................................................................................................273
Chapter 13
Reset Control Module (RCM)
13.1 Introduction...................................................................................................................................................................275
13.2 Reset memory map and register descriptions...............................................................................................................275
13.2.1 System Reset Status Register 0 (RCM_SRS0)..............................................................................................275
13.2.2 System Reset Status Register 1 (RCM_SRS1)..............................................................................................277
13.2.3 Reset Pin Filter Control register (RCM_RPFC)............................................................................................278
13.2.4 Reset Pin Filter Width register (RCM_RPFW).............................................................................................279
13.2.5 Mode Register (RCM_MR)...........................................................................................................................281
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Chapter 14
System Mode Controller
14.1 Introduction...................................................................................................................................................................283
14.2 Modes of operation.......................................................................................................................................................283
14.3 Memory map and register descriptions.........................................................................................................................285
14.3.1 Power Mode Protection register (SMC_PMPROT).......................................................................................285
14.3.2 Power Mode Control register (SMC_PMCTRL)...........................................................................................287
14.3.3 VLLS Control register (SMC_VLLSCTRL).................................................................................................288
14.3.4 Power Mode Status register (SMC_PMSTAT).............................................................................................289
14.4 Functional description...................................................................................................................................................290
14.4.1 Power mode transitions..................................................................................................................................290
14.4.2 Power mode entry/exit sequencing................................................................................................................293
14.4.3 Run modes......................................................................................................................................................295
14.4.4 Wait modes....................................................................................................................................................297
14.4.5 Stop modes.....................................................................................................................................................298
14.4.6 Debug in low power modes...........................................................................................................................301
Chapter 15
Power Management Controller
15.1 Introduction...................................................................................................................................................................303
15.2 Features.........................................................................................................................................................................303
15.3 Low-voltage detect (LVD) system................................................................................................................................303
15.3.1 LVD reset operation.......................................................................................................................................304
15.3.2 LVD interrupt operation.................................................................................................................................304
15.3.3 Low-voltage warning (LVW) interrupt operation.........................................................................................304
15.4 I/O retention..................................................................................................................................................................305
15.5 Memory map and register descriptions.........................................................................................................................305
15.5.1 Low Voltage Detect Status And Control 1 register (PMC_LVDSC1)..........................................................305
15.5.2 Low Voltage Detect Status And Control 2 register (PMC_LVDSC2)..........................................................307
15.5.3 Regulator Status And Control register (PMC_REGSC)................................................................................308
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Chapter 16
Low-Leakage Wakeup Unit (LLWU)
16.1 Introduction...................................................................................................................................................................311
16.1.1 Features..........................................................................................................................................................311
16.1.2 Modes of operation........................................................................................................................................312
16.1.3 Block diagram................................................................................................................................................313
16.2 LLWU signal descriptions............................................................................................................................................314
16.3 Memory map/register definition...................................................................................................................................315
16.3.1 LLWU Pin Enable 1 register (LLWU_PE1)..................................................................................................316
16.3.2 LLWU Pin Enable 2 register (LLWU_PE2)..................................................................................................317
16.3.3 LLWU Pin Enable 3 register (LLWU_PE3)..................................................................................................318
16.3.4 LLWU Pin Enable 4 register (LLWU_PE4)..................................................................................................319
16.3.5 LLWU Module Enable register (LLWU_ME)..............................................................................................320
16.3.6 LLWU Flag 1 register (LLWU_F1)...............................................................................................................322
16.3.7 LLWU Flag 2 register (LLWU_F2)...............................................................................................................323
16.3.8 LLWU Flag 3 register (LLWU_F3)...............................................................................................................325
16.3.9 LLWU Pin Filter 1 register (LLWU_FILT1)................................................................................................327
16.3.10 LLWU Pin Filter 2 register (LLWU_FILT2)................................................................................................328
16.3.11 LLWU Reset Enable register (LLWU_RST).................................................................................................329
16.4 Functional description...................................................................................................................................................330
16.4.1 LLS mode.......................................................................................................................................................330
16.4.2 VLLS modes..................................................................................................................................................330
16.4.3 Initialization...................................................................................................................................................331
Chapter 17
Miscellaneous Control Module (MCM)
17.1 Introduction...................................................................................................................................................................333
17.1.1 Features..........................................................................................................................................................333
17.2 Memory map/register descriptions...............................................................................................................................333
17.2.1 Crossbar Switch (AXBS) Slave Configuration (MCM_PLASC)..................................................................334
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17.2.2 Crossbar Switch (AXBS) Master Configuration (MCM_PLAMC)..............................................................334
17.2.3 Control Register (MCM_CR)........................................................................................................................335
Chapter 18
Crossbar Switch (AXBS)
18.1 Introduction...................................................................................................................................................................337
18.1.1 Features..........................................................................................................................................................337
18.2 Memory Map / Register Definition...............................................................................................................................338
18.2.1 Priority Registers Slave (AXBS_PRSn)........................................................................................................339
18.2.2 Control Register (AXBS_CRSn)...................................................................................................................342
18.2.3 Master General Purpose Control Register (AXBS_MGPCRn).....................................................................344
18.3 Functional Description..................................................................................................................................................344
18.3.1 General operation...........................................................................................................................................344
18.3.2 Register coherency.........................................................................................................................................345
18.3.3 Arbitration......................................................................................................................................................346
18.4 Initialization/application information...........................................................................................................................349
Chapter 19
Peripheral Bridge (AIPS-Lite)
19.1 Introduction...................................................................................................................................................................351
19.1.1 Features..........................................................................................................................................................351
19.1.2 General operation...........................................................................................................................................351
19.2 Memory map/register definition...................................................................................................................................352
19.2.1 Master Privilege Register A (AIPSx_MPRA)...............................................................................................354
19.2.2 Peripheral Access Control Register (AIPSx_PACRn)...................................................................................356
19.2.3 Peripheral Access Control Register (AIPSx_PACRn)...................................................................................361
19.3 Functional description...................................................................................................................................................366
19.3.1 Access support...............................................................................................................................................366
Chapter 20
Direct Memory Access Multiplexer (DMAMUX)
20.1 Introduction...................................................................................................................................................................369
20.1.1 Overview........................................................................................................................................................369
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20.1.2 Features..........................................................................................................................................................370
20.1.3 Modes of operation........................................................................................................................................370
20.2 External signal description............................................................................................................................................371
20.3 Memory map/register definition...................................................................................................................................371
20.3.1 Channel Configuration register (DMAMUX_CHCFGn)..............................................................................372
20.4 Functional description...................................................................................................................................................373
20.4.1 DMA channels with periodic triggering capability........................................................................................373
20.4.2 DMA channels with no triggering capability.................................................................................................375
20.4.3 "Always enabled" DMA sources...................................................................................................................375
20.5 Initialization/application information...........................................................................................................................376
20.5.1 Reset...............................................................................................................................................................377
20.5.2 Enabling and configuring sources..................................................................................................................377
Chapter 21
Direct Memory Access Controller (eDMA)
21.1 Introduction...................................................................................................................................................................381
21.1.1 Block diagram................................................................................................................................................381
21.1.2 Block parts.....................................................................................................................................................382
21.1.3 Features..........................................................................................................................................................384
21.2 Modes of operation.......................................................................................................................................................385
21.3 Memory map/register definition...................................................................................................................................385
21.3.1 Control Register (DMA_CR).........................................................................................................................397
21.3.2 Error Status Register (DMA_ES)..................................................................................................................398
21.3.3 Enable Request Register (DMA_ERQ).........................................................................................................400
21.3.4 Enable Error Interrupt Register (DMA_EEI).................................................................................................403
21.3.5 Clear Enable Error Interrupt Register (DMA_CEEI)....................................................................................405
21.3.6 Set Enable Error Interrupt Register (DMA_SEEI)........................................................................................406
21.3.7 Clear Enable Request Register (DMA_CERQ).............................................................................................407
21.3.8 Set Enable Request Register (DMA_SERQ).................................................................................................408
21.3.9 Clear DONE Status Bit Register (DMA_CDNE)..........................................................................................409
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21.3.10 Set START Bit Register (DMA_SSRT)........................................................................................................410
21.3.11 Clear Error Register (DMA_CERR)..............................................................................................................411
21.3.12 Clear Interrupt Request Register (DMA_CINT)...........................................................................................412
21.3.13 Interrupt Request Register (DMA_INT)........................................................................................................412
21.3.14 Error Register (DMA_ERR)..........................................................................................................................415
21.3.15 Hardware Request Status Register (DMA_HRS)..........................................................................................417
21.3.16 Channel n Priority Register (DMA_DCHPRIn)............................................................................................420
21.3.17 TCD Source Address (DMA_TCDn_SADDR).............................................................................................421
21.3.18 TCD Signed Source Address Offset (DMA_TCDn_SOFF)..........................................................................421
21.3.19 TCD Transfer Attributes (DMA_TCDn_ATTR)...........................................................................................422
21.3.20 TCD Minor Byte Count (Minor Loop Disabled) (DMA_TCDn_NBYTES_MLNO)...................................423
21.3.21 TCD Signed Minor Loop Offset (Minor Loop Enabled and Offset Disabled)
(DMA_TCDn_NBYTES_MLOFFNO).........................................................................................................423
21.3.22 TCD Signed Minor Loop Offset (Minor Loop and Offset Enabled)
(DMA_TCDn_NBYTES_MLOFFYES).......................................................................................................424
21.3.23 TCD Last Source Address Adjustment (DMA_TCDn_SLAST)...................................................................426
21.3.24 TCD Destination Address (DMA_TCDn_DADDR).....................................................................................426
21.3.25 TCD Signed Destination Address Offset (DMA_TCDn_DOFF)..................................................................427
21.3.26 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_CITER_ELINKYES).............................................................................................................427
21.3.27 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_CITER_ELINKNO)..............................................................................................................428
21.3.28 TCD Last Destination Address Adjustment/Scatter Gather Address (DMA_TCDn_DLASTSGA)............429
21.3.29 TCD Control and Status (DMA_TCDn_CSR)..............................................................................................430
21.3.30 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_BITER_ELINKYES).............................................................................................................432
21.3.31 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_BITER_ELINKNO)..............................................................................................................433
21.4 Functional description...................................................................................................................................................434
21.4.1 eDMA basic data flow...................................................................................................................................434
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21.4.2 Error reporting and handling..........................................................................................................................437
21.4.3 Channel preemption.......................................................................................................................................439
21.4.4 Performance...................................................................................................................................................439
21.5 Initialization/application information...........................................................................................................................444
21.5.1 eDMA initialization.......................................................................................................................................444
21.5.2 Programming errors.......................................................................................................................................446
21.5.3 Arbitration mode considerations....................................................................................................................446
21.5.4 Performing DMA transfers (examples)..........................................................................................................447
21.5.5 Monitoring transfer descriptor status.............................................................................................................451
21.5.6 Channel Linking.............................................................................................................................................452
21.5.7 Dynamic programming..................................................................................................................................454
Chapter 22
External Watchdog Monitor (EWM)
22.1 Introduction...................................................................................................................................................................459
22.1.1 Features..........................................................................................................................................................459
22.1.2 Modes of Operation.......................................................................................................................................460
22.1.3 Block Diagram...............................................................................................................................................461
22.2 EWM Signal Descriptions............................................................................................................................................462
22.3 Memory Map/Register Definition.................................................................................................................................462
22.3.1 Control Register (EWM_CTRL)...................................................................................................................462
22.3.2 Service Register (EWM_SERV)....................................................................................................................463
22.3.3 Compare Low Register (EWM_CMPL)........................................................................................................463
22.3.4 Compare High Register (EWM_CMPH).......................................................................................................464
22.4 Functional Description..................................................................................................................................................465
22.4.1 The EWM_out Signal....................................................................................................................................465
22.4.2 The EWM_in Signal......................................................................................................................................465
22.4.3 EWM Counter................................................................................................................................................466
22.4.4 EWM Compare Registers..............................................................................................................................466
22.4.5 EWM Refresh Mechanism.............................................................................................................................467
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22.4.6 EWM Interrupt...............................................................................................................................................467
Chapter 23
Watchdog Timer (WDOG)
23.1 Introduction...................................................................................................................................................................469
23.2 Features.........................................................................................................................................................................469
23.3 Functional overview......................................................................................................................................................471
23.3.1 Unlocking and updating the watchdog...........................................................................................................472
23.3.2 Watchdog configuration time (WCT)............................................................................................................473
23.3.3 Refreshing the watchdog................................................................................................................................474
23.3.4 Windowed mode of operation........................................................................................................................474
23.3.5 Watchdog disabled mode of operation...........................................................................................................474
23.3.6 Low-power modes of operation.....................................................................................................................475
23.3.7 Debug modes of operation.............................................................................................................................475
23.4 Testing the watchdog....................................................................................................................................................476
23.4.1 Quick test.......................................................................................................................................................476
23.4.2 Byte test..........................................................................................................................................................477
23.5 Backup reset generator..................................................................................................................................................478
23.6 Generated resets and interrupts.....................................................................................................................................478
23.7 Memory map and register definition.............................................................................................................................479
23.7.1 Watchdog Status and Control Register High (WDOG_STCTRLH).............................................................480
23.7.2 Watchdog Status and Control Register Low (WDOG_STCTRLL)..............................................................481
23.7.3 Watchdog Time-out Value Register High (WDOG_TOVALH)...................................................................482
23.7.4 Watchdog Time-out Value Register Low (WDOG_TOVALL)....................................................................482
23.7.5 Watchdog Window Register High (WDOG_WINH)....................................................................................483
23.7.6 Watchdog Window Register Low (WDOG_WINL).....................................................................................483
23.7.7 Watchdog Refresh register (WDOG_REFRESH).........................................................................................484
23.7.8 Watchdog Unlock register (WDOG_UNLOCK)...........................................................................................484
23.7.9 Watchdog Timer Output Register High (WDOG_TMROUTH)...................................................................484
23.7.10 Watchdog Timer Output Register Low (WDOG_TMROUTL)....................................................................485
K40 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
18 Freescale Semiconductor, Inc.
Section number Title Page
23.7.11 Watchdog Reset Count register (WDOG_RSTCNT)....................................................................................485
23.7.12 Watchdog Prescaler register (WDOG_PRESC)............................................................................................486
23.8 Watchdog operation with 8-bit access..........................................................................................................................486
23.8.1 General guideline...........................................................................................................................................486
23.8.2 Refresh and unlock operations with 8-bit access...........................................................................................486
23.9 Restrictions on watchdog operation..............................................................................................................................487
Chapter 24
Multipurpose Clock Generator (MCG)
24.1 Introduction...................................................................................................................................................................491
24.1.1 Features..........................................................................................................................................................491
24.1.2 Modes of Operation.......................................................................................................................................495
24.2 External Signal Description..........................................................................................................................................495
24.3 Memory Map/Register Definition.................................................................................................................................495
24.3.1 MCG Control 1 Register (MCG_C1).............................................................................................................496
24.3.2 MCG Control 2 Register (MCG_C2).............................................................................................................497
24.3.3 MCG Control 3 Register (MCG_C3).............................................................................................................498
24.3.4 MCG Control 4 Register (MCG_C4).............................................................................................................499
24.3.5 MCG Control 5 Register (MCG_C5).............................................................................................................500
24.3.6 MCG Control 6 Register (MCG_C6).............................................................................................................501
24.3.7 MCG Status Register (MCG_S)....................................................................................................................503
24.3.8 MCG Status and Control Register (MCG_SC)..............................................................................................504
24.3.9 MCG Auto Trim Compare Value High Register (MCG_ATCVH)..............................................................506
24.3.10 MCG Auto Trim Compare Value Low Register (MCG_ATCVL)................................................................506
24.3.11 MCG Control 7 Register (MCG_C7).............................................................................................................506
24.3.12 MCG Control 8 Register (MCG_C8).............................................................................................................507
24.4 Functional description...................................................................................................................................................508
24.4.1 MCG mode state diagram..............................................................................................................................508
24.4.2 Low Power Bit Usage....................................................................................................................................513
K40 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc. 19
Section number Title Page
24.4.3 MCG Internal Reference Clocks....................................................................................................................513
24.4.4 External Reference Clock..............................................................................................................................513
24.4.5 MCG Fixed frequency clock .........................................................................................................................514
24.4.6 MCG PLL clock ............................................................................................................................................514
24.4.7 MCG Auto TRIM (ATM)..............................................................................................................................515
24.5 Initialization / Application information........................................................................................................................516
24.5.1 MCG module initialization sequence.............................................................................................................516
24.5.2 Using a 32.768 kHz reference........................................................................................................................518
24.5.3 MCG mode switching....................................................................................................................................519
Chapter 25
Oscillator (OSC)
25.1 Introduction...................................................................................................................................................................529
25.2 Features and Modes......................................................................................................................................................529
25.3 Block Diagram..............................................................................................................................................................530
25.4 OSC Signal Descriptions..............................................................................................................................................530
25.5 External Crystal / Resonator Connections....................................................................................................................531
25.6 External Clock Connections.........................................................................................................................................532
25.7 Memory Map/Register Definitions...............................................................................................................................533
25.7.1 OSC Memory Map/Register Definition.........................................................................................................533
25.8 Functional Description..................................................................................................................................................534
25.8.1 OSC Module States........................................................................................................................................534
25.8.2 OSC Module Modes.......................................................................................................................................536
25.8.3 Counter...........................................................................................................................................................538
25.8.4 Reference Clock Pin Requirements...............................................................................................................538
25.9 Reset..............................................................................................................................................................................538
25.10 Low Power Modes Operation.......................................................................................................................................539
25.11 Interrupts.......................................................................................................................................................................539
K40 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
20 Freescale Semiconductor, Inc.
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NXP K40_72 Reference guide

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Reference guide

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