NXP K20_50 Reference guide

Type
Reference guide
K20 Sub-Family Reference Manual
Supports: MK20DN32VLF5, MK20DX32VLF5, MK20DN64VLF5,
MK20DX64VLF5, MK20DN128VLF5, MK20DX128VLF5,
MK20DN32VFT5, MK20DX32VFT5, MK20DN64VFT5,
MK20DX64VFT5, MK20DN128VFT5, MK20DX128VFT5
Document Number: K20P48M50SF0RM
Rev. 2, Feb 2012
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2 Freescale Semiconductor, Inc.
Contents
Section Number Title Page
Chapter 1
About This Document
1.1 Overview.......................................................................................................................................................................45
1.1.1 Purpose.........................................................................................................................................................45
1.1.2 Audience......................................................................................................................................................45
1.2 Conventions..................................................................................................................................................................45
1.2.1 Numbering systems......................................................................................................................................45
1.2.2 Typographic notation...................................................................................................................................46
1.2.3 Special terms................................................................................................................................................46
Chapter 2
Introduction
2.1 Overview.......................................................................................................................................................................47
2.2 Kinetis Portfolio............................................................................................................................................................47
2.3 K20 Family Introduction...............................................................................................................................................50
2.4 Module Functional Categories......................................................................................................................................50
2.4.1 ARM Cortex-M4 Core Modules..................................................................................................................51
2.4.2 System Modules...........................................................................................................................................52
2.4.3 Memories and Memory Interfaces...............................................................................................................53
2.4.4 Clocks...........................................................................................................................................................53
2.4.5 Security and Integrity modules....................................................................................................................54
2.4.6 Analog modules...........................................................................................................................................54
2.4.7 Timer modules.............................................................................................................................................54
2.4.8 Communication interfaces...........................................................................................................................56
2.4.9 Human-machine interfaces..........................................................................................................................56
2.5 Orderable part numbers.................................................................................................................................................57
Chapter 3
Chip Configuration
3.1 Introduction...................................................................................................................................................................59
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3.2 Core modules................................................................................................................................................................59
3.2.1 ARM Cortex-M4 Core Configuration..........................................................................................................59
3.2.2 Nested Vectored Interrupt Controller (NVIC) Configuration......................................................................61
3.2.3 Asynchronous Wake-up Interrupt Controller (AWIC) Configuration.........................................................66
3.2.4 JTAG Controller Configuration...................................................................................................................68
3.3 System modules............................................................................................................................................................68
3.3.1 SIM Configuration.......................................................................................................................................68
3.3.2 System Mode Controller (SMC) Configuration...........................................................................................69
3.3.3 PMC Configuration......................................................................................................................................69
3.3.4 Low-Leakage Wake-up Unit (LLWU) Configuration.................................................................................70
3.3.5 MCM Configuration....................................................................................................................................72
3.3.6 Crossbar-Light Switch Configuration..........................................................................................................73
3.3.7 Peripheral Bridge Configuration..................................................................................................................75
3.3.8 DMA request multiplexer configuration......................................................................................................75
3.3.9 DMA Controller Configuration...................................................................................................................78
3.3.10 External Watchdog Monitor (EWM) Configuration....................................................................................79
3.3.11 Watchdog Configuration..............................................................................................................................81
3.4 Clock Modules..............................................................................................................................................................82
3.4.1 MCG Configuration.....................................................................................................................................82
3.4.2 OSC Configuration......................................................................................................................................83
3.4.3 RTC OSC configuration...............................................................................................................................84
3.5 Memories and Memory Interfaces................................................................................................................................84
3.5.1 Flash Memory Configuration.......................................................................................................................84
3.5.2 Flash Memory Controller Configuration.....................................................................................................88
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3.5.3 SRAM Configuration...................................................................................................................................88
3.5.4 System Register File Configuration.............................................................................................................91
3.5.5 VBAT Register File Configuration..............................................................................................................91
3.5.6 EzPort Configuration...................................................................................................................................92
3.6 Security.........................................................................................................................................................................93
3.6.1 CRC Configuration......................................................................................................................................93
3.7 Analog...........................................................................................................................................................................94
3.7.1 16-bit SAR ADC Configuration..................................................................................................................94
3.7.2 CMP Configuration......................................................................................................................................98
3.7.3 VREF Configuration....................................................................................................................................100
3.8 Timers...........................................................................................................................................................................101
3.8.1 PDB Configuration......................................................................................................................................101
3.8.2 FlexTimer Configuration.............................................................................................................................104
3.8.3 PIT Configuration........................................................................................................................................107
3.8.4 Low-power timer configuration...................................................................................................................108
3.8.5 CMT Configuration......................................................................................................................................110
3.8.6 RTC configuration.......................................................................................................................................111
3.9 Communication interfaces............................................................................................................................................112
3.9.1 Universal Serial Bus (USB) FS Subsystem.................................................................................................112
3.9.2 SPI configuration.........................................................................................................................................117
3.9.3 I2C Configuration........................................................................................................................................120
3.9.4 UART Configuration...................................................................................................................................121
3.9.5 I2S configuration..........................................................................................................................................123
3.10 Human-machine interfaces (HMI)................................................................................................................................127
3.10.1 GPIO configuration......................................................................................................................................127
3.10.2 TSI Configuration........................................................................................................................................128
Chapter 4
Memory Map
4.1 Introduction...................................................................................................................................................................131
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4.2 System memory map.....................................................................................................................................................131
4.2.1 Aliased bit-band regions..............................................................................................................................132
4.3 Flash Memory Map.......................................................................................................................................................133
4.3.1 Alternate Non-Volatile IRC User Trim Description....................................................................................134
4.4 SRAM memory map.....................................................................................................................................................134
4.5 Peripheral bridge (AIPS-Lite) memory map.................................................................................................................135
4.5.1 Peripheral Bridge 0 (AIPS-Lite 0) Memory Map........................................................................................135
4.6 Private Peripheral Bus (PPB) memory map..................................................................................................................139
Chapter 5
Clock Distribution
5.1 Introduction...................................................................................................................................................................141
5.2 Programming model......................................................................................................................................................141
5.3 High-Level device clocking diagram............................................................................................................................141
5.4 Clock definitions...........................................................................................................................................................142
5.4.1 Device clock summary.................................................................................................................................143
5.5 Internal clocking requirements.....................................................................................................................................144
5.5.1 Clock divider values after reset....................................................................................................................145
5.5.2 VLPR mode clocking...................................................................................................................................145
5.6 Clock Gating.................................................................................................................................................................146
5.7 Module clocks...............................................................................................................................................................146
5.7.1 PMC 1-kHz LPO clock................................................................................................................................148
5.7.2 WDOG clocking..........................................................................................................................................148
5.7.3 Debug trace clock.........................................................................................................................................148
5.7.4 PORT digital filter clocking.........................................................................................................................149
5.7.5 LPTMR clocking..........................................................................................................................................149
5.7.6 USB FS OTG Controller clocking...............................................................................................................150
5.7.7 UART clocking............................................................................................................................................150
5.7.8 I2S/SAI clocking..........................................................................................................................................151
5.7.9 TSI clocking.................................................................................................................................................151
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Chapter 6
Reset and Boot
6.1 Introduction...................................................................................................................................................................153
6.2 Reset..............................................................................................................................................................................154
6.2.1 Power-on reset (POR)..................................................................................................................................154
6.2.2 System reset sources....................................................................................................................................154
6.2.3 MCU Resets.................................................................................................................................................158
6.2.4 Reset Pin .....................................................................................................................................................160
6.2.5 Debug resets.................................................................................................................................................160
6.3 Boot...............................................................................................................................................................................161
6.3.1 Boot sources.................................................................................................................................................161
6.3.2 Boot options.................................................................................................................................................161
6.3.3 FOPT boot options.......................................................................................................................................162
6.3.4 Boot sequence..............................................................................................................................................163
Chapter 7
Power Management
7.1 Introduction...................................................................................................................................................................165
7.2 Power modes.................................................................................................................................................................165
7.3 Entering and exiting power modes...............................................................................................................................167
7.4 Power mode transitions.................................................................................................................................................168
7.5 Power modes shutdown sequencing.............................................................................................................................169
7.6 Module Operation in Low Power Modes......................................................................................................................170
7.7 Clock Gating.................................................................................................................................................................173
Chapter 8
Security
8.1 Introduction...................................................................................................................................................................175
8.2 Flash Security...............................................................................................................................................................175
8.3 Security Interactions with other Modules.....................................................................................................................176
8.3.1 Security Interactions with EzPort................................................................................................................176
8.3.2 Security Interactions with Debug.................................................................................................................176
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Chapter 9
Debug
9.1 Introduction...................................................................................................................................................................177
9.1.1 References....................................................................................................................................................179
9.2 The Debug Port.............................................................................................................................................................179
9.2.1 JTAG-to-SWD change sequence.................................................................................................................180
9.2.2 JTAG-to-cJTAG change sequence...............................................................................................................180
9.3 Debug Port Pin Descriptions.........................................................................................................................................181
9.4 System TAP connection................................................................................................................................................181
9.4.1 IR Codes.......................................................................................................................................................181
9.5 JTAG status and control registers.................................................................................................................................182
9.5.1 MDM-AP Control Register..........................................................................................................................183
9.5.2 MDM-AP Status Register............................................................................................................................185
9.6 Debug Resets................................................................................................................................................................187
9.7 AHB-AP........................................................................................................................................................................187
9.8 ITM...............................................................................................................................................................................188
9.9 Core Trace Connectivity...............................................................................................................................................188
9.10 TPIU..............................................................................................................................................................................188
9.11 DWT.............................................................................................................................................................................188
9.12 Debug in Low Power Modes........................................................................................................................................189
9.12.1 Debug Module State in Low Power Modes.................................................................................................190
9.13 Debug & Security.........................................................................................................................................................190
Chapter 10
Signal Multiplexing and Signal Descriptions
10.1 Introduction...................................................................................................................................................................191
10.2 Signal Multiplexing Integration....................................................................................................................................191
10.2.1 Port control and interrupt module features..................................................................................................192
10.2.2 PCRn reset values for port A.......................................................................................................................192
10.2.3 Clock gating.................................................................................................................................................192
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10.2.4 Signal multiplexing constraints....................................................................................................................193
10.3 Pinout............................................................................................................................................................................193
10.3.1 K20 Signal Multiplexing and Pin Assignments...........................................................................................193
10.3.2 K20 Pinouts..................................................................................................................................................195
10.4 Module Signal Description Tables................................................................................................................................196
10.4.1 Core Modules...............................................................................................................................................196
10.4.2 System Modules...........................................................................................................................................197
10.4.3 Clock Modules.............................................................................................................................................198
10.4.4 Memories and Memory Interfaces...............................................................................................................198
10.4.5 Analog..........................................................................................................................................................198
10.4.6 Communication Interfaces...........................................................................................................................199
10.4.7 Human-Machine Interfaces (HMI)..............................................................................................................201
Chapter 11
Port control and interrupts (PORT)
11.1 Introduction...................................................................................................................................................................203
11.1.1 Overview......................................................................................................................................................203
11.1.2 Features........................................................................................................................................................203
11.1.3 Modes of operation......................................................................................................................................204
11.2 External signal description............................................................................................................................................204
11.3 Detailed signal description............................................................................................................................................205
11.4 Memory map and register definition.............................................................................................................................205
11.4.1 Pin Control Register n (PORTx_PCRn).......................................................................................................211
11.4.2 Global Pin Control Low Register (PORTx_GPCLR)..................................................................................214
11.4.3 Global Pin Control High Register (PORTx_GPCHR).................................................................................214
11.4.4 Interrupt Status Flag Register (PORTx_ISFR)............................................................................................215
11.5 Functional description...................................................................................................................................................216
11.5.1 Pin control....................................................................................................................................................216
11.5.2 Global pin control........................................................................................................................................216
11.5.3 External interrupts........................................................................................................................................217
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Chapter 12
System Integration Module (SIM)
12.1 Introduction...................................................................................................................................................................219
12.1.1 Features........................................................................................................................................................219
12.2 Memory map and register definition.............................................................................................................................220
12.2.1 System Options Register 1 (SIM_SOPT1)..................................................................................................221
12.2.2 SOPT1 Configuration Register (SIM_SOPT1CFG)....................................................................................223
12.2.3 System Options Register 2 (SIM_SOPT2)..................................................................................................224
12.2.4 System Options Register 4 (SIM_SOPT4)..................................................................................................227
12.2.5 System Options Register 5 (SIM_SOPT5)..................................................................................................230
12.2.6 System Options Register 7 (SIM_SOPT7)..................................................................................................232
12.2.7 System Device Identification Register (SIM_SDID)...................................................................................233
12.2.8 System Clock Gating Control Register 4 (SIM_SCGC4)............................................................................235
12.2.9 System Clock Gating Control Register 5 (SIM_SCGC5)............................................................................237
12.2.10 System Clock Gating Control Register 6 (SIM_SCGC6)............................................................................239
12.2.11 System Clock Gating Control Register 7 (SIM_SCGC7)............................................................................241
12.2.12 System Clock Divider Register 1 (SIM_CLKDIV1)...................................................................................242
12.2.13 System Clock Divider Register 2 (SIM_CLKDIV2)...................................................................................244
12.2.14 Flash Configuration Register 1 (SIM_FCFG1)...........................................................................................245
12.2.15 Flash Configuration Register 2 (SIM_FCFG2)...........................................................................................247
12.2.16 Unique Identification Register High (SIM_UIDH).....................................................................................248
12.2.17 Unique Identification Register Mid-High (SIM_UIDMH)..........................................................................248
12.2.18 Unique Identification Register Mid Low (SIM_UIDML)...........................................................................249
12.2.19 Unique Identification Register Low (SIM_UIDL)......................................................................................249
12.3 Functional description...................................................................................................................................................249
Chapter 13
Reset Control Module (RCM)
13.1 Introduction...................................................................................................................................................................251
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13.2 Reset memory map and register descriptions...............................................................................................................251
13.2.1 System Reset Status Register 0 (RCM_SRS0)............................................................................................251
13.2.2 System Reset Status Register 1 (RCM_SRS1)............................................................................................253
13.2.3 Reset Pin Filter Control Register (RCM_RPFC).........................................................................................255
13.2.4 Reset Pin Filter Width Register (RCM_RPFW)..........................................................................................256
13.2.5 Mode Register (RCM_MR).........................................................................................................................257
Chapter 14
System Mode Controller
14.1 Introduction...................................................................................................................................................................259
14.2 Modes of operation.......................................................................................................................................................259
14.3 Memory map and register descriptions.........................................................................................................................261
14.3.1 Power Mode Protection Register (SMC_PMPROT)...................................................................................262
14.3.2 Power Mode Control Register (SMC_PMCTRL).......................................................................................263
14.3.3 VLLS Control Register (SMC_VLLSCTRL)..............................................................................................265
14.3.4 Power Mode Status Register (SMC_PMSTAT)..........................................................................................266
14.4 Functional Description..................................................................................................................................................266
14.4.1 Power mode transitions................................................................................................................................266
14.4.2 Power mode entry/exit sequencing..............................................................................................................269
14.4.3 Run modes....................................................................................................................................................272
14.4.4 Wait modes..................................................................................................................................................273
14.4.5 Stop modes...................................................................................................................................................274
14.4.6 Debug in low power modes.........................................................................................................................277
Chapter 15
Power Management Controller
15.1 Introduction...................................................................................................................................................................279
15.2 Features.........................................................................................................................................................................279
15.3 Low-voltage detect (LVD) system................................................................................................................................279
15.3.1 LVD reset operation.....................................................................................................................................280
15.3.2 LVD interrupt operation...............................................................................................................................280
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15.3.3 Low-voltage warning (LVW) interrupt operation.......................................................................................280
15.4 I/O retention..................................................................................................................................................................281
15.5 Memory map and register descriptions.........................................................................................................................281
15.5.1 Low Voltage Detect Status And Control 1 register (PMC_LVDSC1)........................................................281
15.5.2 Low Voltage Detect Status And Control 2 register (PMC_LVDSC2)........................................................283
15.5.3 Regulator Status And Control register (PMC_REGSC)..............................................................................284
Chapter 16
Low-Leakage Wakeup Unit (LLWU)
16.1 Introduction...................................................................................................................................................................287
16.1.1 Features........................................................................................................................................................287
16.1.2 Modes of operation......................................................................................................................................288
16.1.3 Block diagram..............................................................................................................................................289
16.2 LLWU signal descriptions............................................................................................................................................290
16.3 Memory map/register definition...................................................................................................................................291
16.3.1 LLWU Pin Enable 1 register (LLWU_PE1)................................................................................................292
16.3.2 LLWU Pin Enable 2 register (LLWU_PE2)................................................................................................293
16.3.3 LLWU Pin Enable 3 register (LLWU_PE3)................................................................................................294
16.3.4 LLWU Pin Enable 4 register (LLWU_PE4)................................................................................................295
16.3.5 LLWU Module Enable register (LLWU_ME)............................................................................................296
16.3.6 LLWU Flag 1 register (LLWU_F1).............................................................................................................298
16.3.7 LLWU Flag 2 register (LLWU_F2).............................................................................................................299
16.3.8 LLWU Flag 3 register (LLWU_F3).............................................................................................................301
16.3.9 LLWU Pin Filter 1 register (LLWU_FILT1)..............................................................................................303
16.3.10 LLWU Pin Filter 2 register (LLWU_FILT2)..............................................................................................304
16.3.11 LLWU Reset Enable register (LLWU_RST)...............................................................................................305
16.4 Functional description...................................................................................................................................................306
16.4.1 LLS mode.....................................................................................................................................................306
16.4.2 VLLS modes................................................................................................................................................306
16.4.3 Initialization.................................................................................................................................................307
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Chapter 17
Miscellaneous Control Module (MCM)
17.1 Introduction...................................................................................................................................................................309
17.1.1 Features........................................................................................................................................................309
17.2 Memory Map/Register Descriptions.............................................................................................................................309
17.2.1 Crossbar Switch (AXBS) Slave Configuration (MCM_PLASC)................................................................310
17.2.2 Crossbar Switch (AXBS) Master Configuration (MCM_PLAMC)............................................................310
17.2.3 Crossbar Switch (AXBS) Control Register (MCM_PLACR).....................................................................311
Chapter 18
Crossbar Switch Lite (AXBS-Lite)
18.1 Introduction...................................................................................................................................................................313
18.1.1 Features........................................................................................................................................................313
18.2 Memory Map / Register Definition...............................................................................................................................314
18.3 Functional Description..................................................................................................................................................314
18.3.1 General operation.........................................................................................................................................314
18.3.2 Arbitration....................................................................................................................................................315
18.4 Initialization/application information...........................................................................................................................316
Chapter 19
Peripheral Bridge (AIPS-Lite)
19.1 Introduction...................................................................................................................................................................317
19.1.1 Features........................................................................................................................................................317
19.1.2 General operation.........................................................................................................................................317
19.2 Functional description...................................................................................................................................................318
19.2.1 Access support.............................................................................................................................................318
Chapter 20
Direct Memory Access Multiplexer (DMAMUX)
20.1 Introduction...................................................................................................................................................................319
20.1.1 Overview......................................................................................................................................................319
20.1.2 Features........................................................................................................................................................320
20.1.3 Modes of operation......................................................................................................................................320
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20.2 External signal description............................................................................................................................................321
20.3 Memory map/register definition...................................................................................................................................321
20.3.1 Channel Configuration register (DMAMUXx_CHCFGn)..........................................................................322
20.4 Functional description...................................................................................................................................................323
20.4.1 DMA channels with periodic triggering capability......................................................................................323
20.4.2 DMA channels with no triggering capability...............................................................................................325
20.4.3 "Always enabled" DMA sources.................................................................................................................325
20.5 Initialization/application information...........................................................................................................................327
20.5.1 Reset.............................................................................................................................................................327
20.5.2 Enabling and configuring sources................................................................................................................327
Chapter 21
Direct Memory Access Controller (eDMA)
21.1 Introduction...................................................................................................................................................................331
21.1.1 Block diagram..............................................................................................................................................331
21.1.2 Block parts...................................................................................................................................................332
21.1.3 Features........................................................................................................................................................334
21.2 Modes of operation.......................................................................................................................................................335
21.3 Memory map/register definition...................................................................................................................................335
21.3.1 Control Register (DMA_CR).......................................................................................................................340
21.3.2 Error Status Register (DMA_ES)................................................................................................................342
21.3.3 Enable Request Register (DMA_ERQ).......................................................................................................344
21.3.4 Enable Error Interrupt Register (DMA_EEI)...............................................................................................345
21.3.5 Clear Enable Error Interrupt Register (DMA_CEEI)..................................................................................346
21.3.6 Set Enable Error Interrupt Register (DMA_SEEI)......................................................................................347
21.3.7 Clear Enable Request Register (DMA_CERQ)...........................................................................................348
21.3.8 Set Enable Request Register (DMA_SERQ)...............................................................................................349
21.3.9 Clear DONE Status Bit Register (DMA_CDNE)........................................................................................350
21.3.10 Set START Bit Register (DMA_SSRT)......................................................................................................351
21.3.11 Clear Error Register (DMA_CERR)............................................................................................................352
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21.3.12 Clear Interrupt Request Register (DMA_CINT).........................................................................................353
21.3.13 Interrupt Request Register (DMA_INT)......................................................................................................353
21.3.14 Error Register (DMA_ERR)........................................................................................................................355
21.3.15 Hardware Request Status Register (DMA_HRS)........................................................................................356
21.3.16 Channel n Priority Register (DMA_DCHPRIn)..........................................................................................357
21.3.17 TCD Source Address (DMA_TCDn_SADDR)...........................................................................................358
21.3.18 TCD Signed Source Address Offset (DMA_TCDn_SOFF)........................................................................358
21.3.19 TCD Transfer Attributes (DMA_TCDn_ATTR).........................................................................................359
21.3.20 TCD Minor Byte Count (Minor Loop Disabled) (DMA_TCDn_NBYTES_MLNO).................................360
21.3.21 TCD Signed Minor Loop Offset (Minor Loop Enabled and Offset Disabled)
(DMA_TCDn_NBYTES_MLOFFNO).......................................................................................................361
21.3.22 TCD Signed Minor Loop Offset (Minor Loop and Offset Enabled)
(DMA_TCDn_NBYTES_MLOFFYES).....................................................................................................362
21.3.23 TCD Last Source Address Adjustment (DMA_TCDn_SLAST).................................................................363
21.3.24 TCD Destination Address (DMA_TCDn_DADDR)...................................................................................363
21.3.25 TCD Signed Destination Address Offset (DMA_TCDn_DOFF)................................................................364
21.3.26 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_CITER_ELINKYES)...........................................................................................................365
21.3.27 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_CITER_ELINKNO)............................................................................................................366
21.3.28 TCD Last Destination Address Adjustment/Scatter Gather Address (DMA_TCDn_DLASTSGA)..........367
21.3.29 TCD Control and Status (DMA_TCDn_CSR)............................................................................................368
21.3.30 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_BITER_ELINKYES)...........................................................................................................370
21.3.31 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_BITER_ELINKNO)............................................................................................................371
21.4 Functional description...................................................................................................................................................372
21.4.1 eDMA basic data flow.................................................................................................................................372
21.4.2 Error reporting and handling........................................................................................................................375
21.4.3 Channel preemption.....................................................................................................................................377
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21.4.4 Performance.................................................................................................................................................377
21.5 Initialization/application information...........................................................................................................................381
21.5.1 eDMA initialization.....................................................................................................................................381
21.5.2 Programming errors.....................................................................................................................................383
21.5.3 Arbitration mode considerations..................................................................................................................384
21.5.4 Performing DMA transfers (examples)........................................................................................................384
21.5.5 Monitoring transfer descriptor status...........................................................................................................388
21.5.6 Channel Linking...........................................................................................................................................390
21.5.7 Dynamic programming................................................................................................................................391
Chapter 22
External Watchdog Monitor (EWM)
22.1 Introduction...................................................................................................................................................................395
22.1.1 Features........................................................................................................................................................395
22.1.2 Modes of Operation.....................................................................................................................................396
22.1.3 Block Diagram.............................................................................................................................................397
22.2 EWM Signal Descriptions............................................................................................................................................398
22.3 Memory Map/Register Definition.................................................................................................................................398
22.3.1 Control Register (EWM_CTRL).................................................................................................................398
22.3.2 Service Register (EWM_SERV)..................................................................................................................399
22.3.3 Compare Low Register (EWM_CMPL)......................................................................................................400
22.3.4 Compare High Register (EWM_CMPH).....................................................................................................400
22.4 Functional Description..................................................................................................................................................401
22.4.1 The EWM_out Signal..................................................................................................................................401
22.4.2 The EWM_in Signal....................................................................................................................................402
22.4.3 EWM Counter..............................................................................................................................................402
22.4.4 EWM Compare Registers............................................................................................................................402
22.4.5 EWM Refresh Mechanism...........................................................................................................................403
22.4.6 EWM Interrupt.............................................................................................................................................403
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Chapter 23
Watchdog Timer (WDOG)
23.1 Introduction...................................................................................................................................................................405
23.2 Features.........................................................................................................................................................................405
23.3 Functional overview......................................................................................................................................................407
23.3.1 Unlocking and updating the watchdog.........................................................................................................408
23.3.2 Watchdog configuration time (WCT)..........................................................................................................409
23.3.3 Refreshing the watchdog..............................................................................................................................410
23.3.4 Windowed mode of operation......................................................................................................................410
23.3.5 Watchdog disabled mode of operation.........................................................................................................410
23.3.6 Low-power modes of operation...................................................................................................................411
23.3.7 Debug modes of operation...........................................................................................................................411
23.4 Testing the watchdog....................................................................................................................................................412
23.4.1 Quick test.....................................................................................................................................................412
23.4.2 Byte test........................................................................................................................................................413
23.5 Backup reset generator..................................................................................................................................................414
23.6 Generated resets and interrupts.....................................................................................................................................414
23.7 Memory map and register definition.............................................................................................................................415
23.7.1 Watchdog Status and Control Register High (WDOG_STCTRLH)...........................................................416
23.7.2 Watchdog Status and Control Register Low (WDOG_STCTRLL)............................................................418
23.7.3 Watchdog Time-out Value Register High (WDOG_TOVALH).................................................................418
23.7.4 Watchdog Time-out Value Register Low (WDOG_TOVALL)..................................................................419
23.7.5 Watchdog Window Register High (WDOG_WINH)..................................................................................419
23.7.6 Watchdog Window Register Low (WDOG_WINL)...................................................................................420
23.7.7 Watchdog Refresh register (WDOG_REFRESH).......................................................................................420
23.7.8 Watchdog Unlock register (WDOG_UNLOCK).........................................................................................421
23.7.9 Watchdog Timer Output Register High (WDOG_TMROUTH).................................................................421
23.7.10 Watchdog Timer Output Register Low (WDOG_TMROUTL)..................................................................421
23.7.11 Watchdog Reset Count register (WDOG_RSTCNT)..................................................................................422
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 17
Section Number Title Page
23.7.12 Watchdog Prescaler register (WDOG_PRESC)..........................................................................................422
23.8 Watchdog operation with 8-bit access..........................................................................................................................422
23.8.1 General guideline.........................................................................................................................................423
23.8.2 Refresh and unlock operations with 8-bit access.........................................................................................423
23.9 Restrictions on watchdog operation..............................................................................................................................424
Chapter 24
Multipurpose Clock Generator (MCG)
24.1 Introduction...................................................................................................................................................................427
24.1.1 Features........................................................................................................................................................427
24.1.2 Modes of Operation.....................................................................................................................................430
24.2 External Signal Description..........................................................................................................................................431
24.3 Memory Map/Register Definition.................................................................................................................................431
24.3.1 MCG Control 1 Register (MCG_C1)...........................................................................................................432
24.3.2 MCG Control 2 Register (MCG_C2)...........................................................................................................433
24.3.3 MCG Control 3 Register (MCG_C3)...........................................................................................................434
24.3.4 MCG Control 4 Register (MCG_C4)...........................................................................................................435
24.3.5 MCG Control 5 Register (MCG_C5)...........................................................................................................436
24.3.6 MCG Control 6 Register (MCG_C6)...........................................................................................................437
24.3.7 MCG Status Register (MCG_S)..................................................................................................................439
24.3.8 MCG Status and Control Register (MCG_SC)............................................................................................440
24.3.9 MCG Auto Trim Compare Value High Register (MCG_ATCVH)............................................................442
24.3.10 MCG Auto Trim Compare Value Low Register (MCG_ATCVL)..............................................................442
24.3.11 MCG Control 7 Register (MCG_C7)...........................................................................................................442
24.3.12 MCG Control 8 Register (MCG_C8)...........................................................................................................443
24.4 Functional Description..................................................................................................................................................444
24.4.1 MCG mode state diagram............................................................................................................................444
24.4.2 Low Power Bit Usage..................................................................................................................................449
24.4.3 MCG Internal Reference Clocks..................................................................................................................449
24.4.4 External Reference Clock............................................................................................................................450
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
18 Freescale Semiconductor, Inc.
Section Number Title Page
24.4.5 MCG Fixed frequency clock .......................................................................................................................450
24.4.6 MCG PLL clock ..........................................................................................................................................451
24.4.7 MCG Auto TRIM (ATM)............................................................................................................................451
24.5 Initialization / Application information........................................................................................................................452
24.5.1 MCG module initialization sequence...........................................................................................................452
24.5.2 Using a 32.768 kHz reference......................................................................................................................454
24.5.3 MCG mode switching..................................................................................................................................455
Chapter 25
Oscillator (OSC)
25.1 Introduction...................................................................................................................................................................465
25.2 Features and Modes......................................................................................................................................................465
25.3 Block Diagram..............................................................................................................................................................466
25.4 OSC Signal Descriptions..............................................................................................................................................466
25.5 External Crystal / Resonator Connections....................................................................................................................467
25.6 External Clock Connections.........................................................................................................................................468
25.7 Memory Map/Register Definitions...............................................................................................................................469
25.7.1 OSC Memory Map/Register Definition.......................................................................................................469
25.8 Functional Description..................................................................................................................................................470
25.8.1 OSC Module States......................................................................................................................................471
25.8.2 OSC Module Modes.....................................................................................................................................472
25.8.3 Counter.........................................................................................................................................................474
25.8.4 Reference Clock Pin Requirements.............................................................................................................474
25.9 Reset..............................................................................................................................................................................474
25.10 Low Power Modes Operation.......................................................................................................................................475
25.11 Interrupts.......................................................................................................................................................................475
Chapter 26
RTC Oscillator
26.1 Introduction...................................................................................................................................................................477
26.1.1 Features and Modes.....................................................................................................................................477
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 19
Section Number Title Page
26.1.2 Block Diagram.............................................................................................................................................477
26.2 RTC Signal Descriptions..............................................................................................................................................478
26.2.1 EXTAL32 — Oscillator Input.....................................................................................................................478
26.2.2 XTAL32 — Oscillator Output.....................................................................................................................478
26.3 External Crystal Connections.......................................................................................................................................479
26.4 Memory Map/Register Descriptions.............................................................................................................................479
26.5 Functional Description..................................................................................................................................................479
26.6 Reset Overview.............................................................................................................................................................480
26.7 Interrupts.......................................................................................................................................................................480
Chapter 27
Flash Memory Controller (FMC)
27.1 Introduction...................................................................................................................................................................481
27.1.1 Overview......................................................................................................................................................481
27.1.2 Features........................................................................................................................................................482
27.2 Modes of operation.......................................................................................................................................................482
27.3 External signal description............................................................................................................................................482
27.4 Memory map and register descriptions.........................................................................................................................483
27.4.1 Flash Access Protection Register (FMC_PFAPR).......................................................................................485
27.4.2 Flash Control Register (FMC_PFB0CR).....................................................................................................487
27.4.3 Cache Tag Storage (FMC_TAGVDW0Sn).................................................................................................489
27.4.4 Cache Tag Storage (FMC_TAGVDW1Sn).................................................................................................490
27.4.5 Cache Tag Storage (FMC_TAGVDW2Sn).................................................................................................490
27.4.6 Cache Tag Storage (FMC_TAGVDW3Sn).................................................................................................491
27.4.7 Cache Data Storage (FMC_DATAW0Sn)...................................................................................................492
27.4.8 Cache Data Storage (FMC_DATAW1Sn)...................................................................................................492
27.4.9 Cache Data Storage (FMC_DATAW2Sn)...................................................................................................493
27.4.10 Cache Data Storage (FMC_DATAW3Sn)...................................................................................................493
27.5 Functional description...................................................................................................................................................494
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
20 Freescale Semiconductor, Inc.
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NXP K20_50 Reference guide

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Reference guide

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