NXP K51_72 Reference guide

Type
Reference guide
K51 Sub-Family Reference Manual
Supports: MK51DX128CLK7, MK51DX256CLK7
Document Number: K51P81M72SF1RM
Rev. 1.1, Dec 2012
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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..........................................................................................................................60
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.............................................................................................................94
3.5.6 VBAT Register File Configuration..............................................................................................................95
3.5.7 EzPort Configuration...................................................................................................................................96
3.6 Security.........................................................................................................................................................................97
3.6.1 CRC Configuration......................................................................................................................................97
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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 Op-amp Configuration.................................................................................................................................109
3.7.5 TRIAMP Configuration...............................................................................................................................111
3.7.6 VREF Configuration....................................................................................................................................112
3.8 Timers...........................................................................................................................................................................113
3.8.1 PDB Configuration......................................................................................................................................114
3.8.2 FlexTimer Configuration.............................................................................................................................117
3.8.3 PIT Configuration........................................................................................................................................120
3.8.4 Low-power timer configuration...................................................................................................................122
3.8.5 CMT Configuration......................................................................................................................................123
3.8.6 RTC configuration.......................................................................................................................................124
3.9 Communication interfaces............................................................................................................................................125
3.9.1 Universal Serial Bus (USB) FS Subsystem.................................................................................................125
3.9.2 SPI configuration.........................................................................................................................................131
3.9.3 I2C Configuration........................................................................................................................................134
3.9.4 UART Configuration...................................................................................................................................134
3.9.5 I2S configuration..........................................................................................................................................137
3.10 Human-machine interfaces...........................................................................................................................................140
3.10.1 GPIO configuration......................................................................................................................................140
3.10.2 TSI Configuration........................................................................................................................................141
3.10.3 Segment LCD Configuration.......................................................................................................................144
Chapter 4
Memory Map
4.1 Introduction...................................................................................................................................................................147
4.2 System memory map.....................................................................................................................................................147
4.2.1 Aliased bit-band regions..............................................................................................................................148
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4.3 Flash Memory Map.......................................................................................................................................................149
4.3.1 Alternate Non-Volatile IRC User Trim Description....................................................................................150
4.4 SRAM memory map.....................................................................................................................................................150
4.5 Peripheral bridge (AIPS-Lite0 and AIPS-Lite1) memory maps...................................................................................151
4.5.1 Peripheral Bridge 0 (AIPS-Lite 0) Memory Map........................................................................................151
4.5.2 Peripheral Bridge 1 (AIPS-Lite 1) Memory Map........................................................................................155
4.6 Private Peripheral Bus (PPB) memory map..................................................................................................................158
Chapter 5
Clock Distribution
5.1 Introduction...................................................................................................................................................................161
5.2 Programming model......................................................................................................................................................161
5.3 High-Level device clocking diagram............................................................................................................................161
5.4 Clock definitions...........................................................................................................................................................162
5.4.1 Device clock summary.................................................................................................................................163
5.5 Internal clocking requirements.....................................................................................................................................164
5.5.1 Clock divider values after reset....................................................................................................................165
5.5.2 VLPR mode clocking...................................................................................................................................166
5.6 Clock Gating.................................................................................................................................................................166
5.7 Module clocks...............................................................................................................................................................166
5.7.1 PMC 1-kHz LPO clock................................................................................................................................168
5.7.2 WDOG clocking..........................................................................................................................................168
5.7.3 Debug trace clock.........................................................................................................................................168
5.7.4 PORT digital filter clocking.........................................................................................................................169
5.7.5 LPTMR clocking..........................................................................................................................................169
5.7.6 USB FS OTG Controller clocking...............................................................................................................170
5.7.7 UART clocking............................................................................................................................................171
5.7.8 I2S/SAI clocking..........................................................................................................................................171
5.7.9 TSI clocking.................................................................................................................................................171
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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 K51 Signal Multiplexing and Pin Assignments...........................................................................................211
10.3.2 K51 Pinouts..................................................................................................................................................214
10.4 Module Signal Description Tables................................................................................................................................216
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.............................................................................................................................................220
10.4.7 Communication Interfaces...........................................................................................................................221
10.4.8 Human-Machine Interfaces (HMI)..............................................................................................................224
Chapter 11
Port control and interrupts (PORT)
11.1 Introduction...................................................................................................................................................................227
11.1.1 Overview......................................................................................................................................................227
11.1.2 External signal description...........................................................................................................................228
11.1.3 Detailed signal description...........................................................................................................................229
11.1.4 Memory map and register definition............................................................................................................229
11.1.5 Functional description..................................................................................................................................239
Chapter 12
System Integration Module (SIM)
12.1 Introduction...................................................................................................................................................................243
12.1.1 Features........................................................................................................................................................243
12.2 Memory map and register definition.............................................................................................................................244
12.2.1 System Options Register 1 (SIM_SOPT1)..................................................................................................245
12.2.2 SOPT1 Configuration Register (SIM_SOPT1CFG)....................................................................................247
12.2.3 System Options Register 2 (SIM_SOPT2)..................................................................................................248
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12.2.4 System Options Register 4 (SIM_SOPT4)..................................................................................................250
12.2.5 System Options Register 5 (SIM_SOPT5)..................................................................................................253
12.2.6 System Options Register 7 (SIM_SOPT7)..................................................................................................254
12.2.7 System Device Identification Register (SIM_SDID)...................................................................................256
12.2.8 System Clock Gating Control Register 1 (SIM_SCGC1)............................................................................257
12.2.9 System Clock Gating Control Register 2 (SIM_SCGC2)............................................................................258
12.2.10 System Clock Gating Control Register 3 (SIM_SCGC3)............................................................................259
12.2.11 System Clock Gating Control Register 4 (SIM_SCGC4)............................................................................261
12.2.12 System Clock Gating Control Register 5 (SIM_SCGC5)............................................................................263
12.2.13 System Clock Gating Control Register 6 (SIM_SCGC6)............................................................................265
12.2.14 System Clock Gating Control Register 7 (SIM_SCGC7)............................................................................267
12.2.15 System Clock Divider Register 1 (SIM_CLKDIV1)...................................................................................268
12.2.16 System Clock Divider Register 2 (SIM_CLKDIV2)...................................................................................270
12.2.17 Flash Configuration Register 1 (SIM_FCFG1)...........................................................................................271
12.2.18 Flash Configuration Register 2 (SIM_FCFG2)...........................................................................................273
12.2.19 Unique Identification Register High (SIM_UIDH).....................................................................................274
12.2.20 Unique Identification Register Mid-High (SIM_UIDMH)..........................................................................274
12.2.21 Unique Identification Register Mid Low (SIM_UIDML)...........................................................................275
12.2.22 Unique Identification Register Low (SIM_UIDL)......................................................................................275
12.3 Functional description...................................................................................................................................................275
Chapter 13
Reset Control Module (RCM)
13.1 Introduction...................................................................................................................................................................277
13.2 Reset memory map and register descriptions...............................................................................................................277
13.2.1 System Reset Status Register 0 (RCM_SRS0)............................................................................................277
13.2.2 System Reset Status Register 1 (RCM_SRS1)............................................................................................279
13.2.3 Reset Pin Filter Control register (RCM_RPFC)..........................................................................................280
13.2.4 Reset Pin Filter Width register (RCM_RPFW)...........................................................................................281
13.2.5 Mode Register (RCM_MR).........................................................................................................................283
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Chapter 14
System Mode Controller
14.1 Introduction...................................................................................................................................................................285
14.2 Modes of operation.......................................................................................................................................................285
14.3 Memory map and register descriptions.........................................................................................................................287
14.3.1 Power Mode Protection register (SMC_PMPROT).....................................................................................287
14.3.2 Power Mode Control register (SMC_PMCTRL).........................................................................................289
14.3.3 VLLS Control register (SMC_VLLSCTRL)...............................................................................................290
14.3.4 Power Mode Status register (SMC_PMSTAT)...........................................................................................291
14.4 Functional description...................................................................................................................................................292
14.4.1 Power mode transitions................................................................................................................................292
14.4.2 Power mode entry/exit sequencing..............................................................................................................295
14.4.3 Run modes....................................................................................................................................................297
14.4.4 Wait modes..................................................................................................................................................299
14.4.5 Stop modes...................................................................................................................................................300
14.4.6 Debug in low power modes.........................................................................................................................303
Chapter 15
Power Management Controller
15.1 Introduction...................................................................................................................................................................305
15.2 Features.........................................................................................................................................................................305
15.3 Low-voltage detect (LVD) system................................................................................................................................305
15.3.1 LVD reset operation.....................................................................................................................................306
15.3.2 LVD interrupt operation...............................................................................................................................306
15.3.3 Low-voltage warning (LVW) interrupt operation.......................................................................................306
15.4 I/O retention..................................................................................................................................................................307
15.5 Memory map and register descriptions.........................................................................................................................307
15.5.1 Low Voltage Detect Status And Control 1 register (PMC_LVDSC1)........................................................307
15.5.2 Low Voltage Detect Status And Control 2 register (PMC_LVDSC2)........................................................309
15.5.3 Regulator Status And Control register (PMC_REGSC)..............................................................................310
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Chapter 16
Low-Leakage Wakeup Unit (LLWU)
16.1 Introduction...................................................................................................................................................................313
16.1.1 Features........................................................................................................................................................313
16.1.2 Modes of operation......................................................................................................................................314
16.1.3 Block diagram..............................................................................................................................................315
16.2 LLWU signal descriptions............................................................................................................................................316
16.3 Memory map/register definition...................................................................................................................................317
16.3.1 LLWU Pin Enable 1 register (LLWU_PE1)................................................................................................318
16.3.2 LLWU Pin Enable 2 register (LLWU_PE2)................................................................................................319
16.3.3 LLWU Pin Enable 3 register (LLWU_PE3)................................................................................................320
16.3.4 LLWU Pin Enable 4 register (LLWU_PE4)................................................................................................321
16.3.5 LLWU Module Enable register (LLWU_ME)............................................................................................322
16.3.6 LLWU Flag 1 register (LLWU_F1).............................................................................................................324
16.3.7 LLWU Flag 2 register (LLWU_F2).............................................................................................................325
16.3.8 LLWU Flag 3 register (LLWU_F3).............................................................................................................327
16.3.9 LLWU Pin Filter 1 register (LLWU_FILT1)..............................................................................................329
16.3.10 LLWU Pin Filter 2 register (LLWU_FILT2)..............................................................................................330
16.3.11 LLWU Reset Enable register (LLWU_RST)...............................................................................................331
16.4 Functional description...................................................................................................................................................332
16.4.1 LLS mode.....................................................................................................................................................332
16.4.2 VLLS modes................................................................................................................................................332
16.4.3 Initialization.................................................................................................................................................333
Chapter 17
Miscellaneous Control Module (MCM)
17.1 Introduction...................................................................................................................................................................335
17.1.1 Features........................................................................................................................................................335
17.2 Memory map/register descriptions...............................................................................................................................335
17.2.1 Crossbar Switch (AXBS) Slave Configuration (MCM_PLASC)................................................................336
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17.2.2 Crossbar Switch (AXBS) Master Configuration (MCM_PLAMC)............................................................336
17.2.3 Control Register (MCM_CR)......................................................................................................................337
Chapter 18
Crossbar Switch (AXBS)
18.1 Introduction...................................................................................................................................................................339
18.1.1 Features........................................................................................................................................................339
18.2 Memory Map / Register Definition...............................................................................................................................340
18.2.1 Priority Registers Slave (AXBS_PRSn)......................................................................................................341
18.2.2 Control Register (AXBS_CRSn).................................................................................................................344
18.2.3 Master General Purpose Control Register (AXBS_MGPCRn)...................................................................346
18.3 Functional Description..................................................................................................................................................346
18.3.1 General operation.........................................................................................................................................346
18.3.2 Register coherency.......................................................................................................................................347
18.3.3 Arbitration....................................................................................................................................................348
18.4 Initialization/application information...........................................................................................................................351
Chapter 19
Peripheral Bridge (AIPS-Lite)
19.1 Introduction...................................................................................................................................................................353
19.1.1 Features........................................................................................................................................................353
19.1.2 General operation.........................................................................................................................................353
19.2 Memory map/register definition...................................................................................................................................354
19.2.1 Master Privilege Register A (AIPSx_MPRA).............................................................................................356
19.2.2 Peripheral Access Control Register (AIPSx_PACRn).................................................................................358
19.2.3 Peripheral Access Control Register (AIPSx_PACRn).................................................................................363
19.3 Functional description...................................................................................................................................................368
19.3.1 Access support.............................................................................................................................................368
Chapter 20
Direct Memory Access Multiplexer (DMAMUX)
20.1 Introduction...................................................................................................................................................................371
20.1.1 Overview......................................................................................................................................................371
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20.1.2 Features........................................................................................................................................................372
20.1.3 Modes of operation......................................................................................................................................372
20.2 External signal description............................................................................................................................................373
20.3 Memory map/register definition...................................................................................................................................373
20.3.1 Channel Configuration register (DMAMUX_CHCFGn)............................................................................374
20.4 Functional description...................................................................................................................................................375
20.4.1 DMA channels with periodic triggering capability......................................................................................375
20.4.2 DMA channels with no triggering capability...............................................................................................377
20.4.3 "Always enabled" DMA sources.................................................................................................................377
20.5 Initialization/application information...........................................................................................................................378
20.5.1 Reset.............................................................................................................................................................379
20.5.2 Enabling and configuring sources................................................................................................................379
Chapter 21
Direct Memory Access Controller (eDMA)
21.1 Introduction...................................................................................................................................................................383
21.1.1 Block diagram..............................................................................................................................................383
21.1.2 Block parts...................................................................................................................................................384
21.1.3 Features........................................................................................................................................................386
21.2 Modes of operation.......................................................................................................................................................387
21.3 Memory map/register definition...................................................................................................................................387
21.3.1 Control Register (DMA_CR).......................................................................................................................399
21.3.2 Error Status Register (DMA_ES)................................................................................................................400
21.3.3 Enable Request Register (DMA_ERQ).......................................................................................................402
21.3.4 Enable Error Interrupt Register (DMA_EEI)...............................................................................................405
21.3.5 Clear Enable Error Interrupt Register (DMA_CEEI)..................................................................................407
21.3.6 Set Enable Error Interrupt Register (DMA_SEEI)......................................................................................408
21.3.7 Clear Enable Request Register (DMA_CERQ)...........................................................................................409
21.3.8 Set Enable Request Register (DMA_SERQ)...............................................................................................410
21.3.9 Clear DONE Status Bit Register (DMA_CDNE)........................................................................................411
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21.3.10 Set START Bit Register (DMA_SSRT)......................................................................................................412
21.3.11 Clear Error Register (DMA_CERR)............................................................................................................413
21.3.12 Clear Interrupt Request Register (DMA_CINT).........................................................................................414
21.3.13 Interrupt Request Register (DMA_INT)......................................................................................................414
21.3.14 Error Register (DMA_ERR)........................................................................................................................417
21.3.15 Hardware Request Status Register (DMA_HRS)........................................................................................419
21.3.16 Channel n Priority Register (DMA_DCHPRIn)..........................................................................................422
21.3.17 TCD Source Address (DMA_TCDn_SADDR)...........................................................................................423
21.3.18 TCD Signed Source Address Offset (DMA_TCDn_SOFF)........................................................................423
21.3.19 TCD Transfer Attributes (DMA_TCDn_ATTR).........................................................................................424
21.3.20 TCD Minor Byte Count (Minor Loop Disabled) (DMA_TCDn_NBYTES_MLNO).................................425
21.3.21 TCD Signed Minor Loop Offset (Minor Loop Enabled and Offset Disabled)
(DMA_TCDn_NBYTES_MLOFFNO).......................................................................................................425
21.3.22 TCD Signed Minor Loop Offset (Minor Loop and Offset Enabled)
(DMA_TCDn_NBYTES_MLOFFYES).....................................................................................................426
21.3.23 TCD Last Source Address Adjustment (DMA_TCDn_SLAST).................................................................428
21.3.24 TCD Destination Address (DMA_TCDn_DADDR)...................................................................................428
21.3.25 TCD Signed Destination Address Offset (DMA_TCDn_DOFF)................................................................429
21.3.26 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_CITER_ELINKYES)...........................................................................................................429
21.3.27 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_CITER_ELINKNO)............................................................................................................430
21.3.28 TCD Last Destination Address Adjustment/Scatter Gather Address (DMA_TCDn_DLASTSGA)..........431
21.3.29 TCD Control and Status (DMA_TCDn_CSR)............................................................................................432
21.3.30 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_BITER_ELINKYES)...........................................................................................................434
21.3.31 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_BITER_ELINKNO)............................................................................................................435
21.4 Functional description...................................................................................................................................................436
21.4.1 eDMA basic data flow.................................................................................................................................436
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21.4.2 Error reporting and handling........................................................................................................................439
21.4.3 Channel preemption.....................................................................................................................................441
21.4.4 Performance.................................................................................................................................................441
21.5 Initialization/application information...........................................................................................................................446
21.5.1 eDMA initialization.....................................................................................................................................446
21.5.2 Programming errors.....................................................................................................................................448
21.5.3 Arbitration mode considerations..................................................................................................................448
21.5.4 Performing DMA transfers (examples)........................................................................................................449
21.5.5 Monitoring transfer descriptor status...........................................................................................................453
21.5.6 Channel Linking...........................................................................................................................................454
21.5.7 Dynamic programming................................................................................................................................456
Chapter 22
External Watchdog Monitor (EWM)
22.1 Introduction...................................................................................................................................................................461
22.1.1 Features........................................................................................................................................................461
22.1.2 Modes of Operation.....................................................................................................................................462
22.1.3 Block Diagram.............................................................................................................................................463
22.2 EWM Signal Descriptions............................................................................................................................................464
22.3 Memory Map/Register Definition.................................................................................................................................464
22.3.1 Control Register (EWM_CTRL).................................................................................................................464
22.3.2 Service Register (EWM_SERV)..................................................................................................................465
22.3.3 Compare Low Register (EWM_CMPL)......................................................................................................465
22.3.4 Compare High Register (EWM_CMPH).....................................................................................................466
22.4 Functional Description..................................................................................................................................................467
22.4.1 The EWM_out Signal..................................................................................................................................467
22.4.2 The EWM_in Signal....................................................................................................................................467
22.4.3 EWM Counter..............................................................................................................................................468
22.4.4 EWM Compare Registers............................................................................................................................468
22.4.5 EWM Refresh Mechanism...........................................................................................................................469
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22.4.6 EWM Interrupt.............................................................................................................................................469
Chapter 23
Watchdog Timer (WDOG)
23.1 Introduction...................................................................................................................................................................471
23.2 Features.........................................................................................................................................................................471
23.3 Functional overview......................................................................................................................................................473
23.3.1 Unlocking and updating the watchdog.........................................................................................................474
23.3.2 Watchdog configuration time (WCT)..........................................................................................................475
23.3.3 Refreshing the watchdog..............................................................................................................................476
23.3.4 Windowed mode of operation......................................................................................................................476
23.3.5 Watchdog disabled mode of operation.........................................................................................................476
23.3.6 Low-power modes of operation...................................................................................................................477
23.3.7 Debug modes of operation...........................................................................................................................477
23.4 Testing the watchdog....................................................................................................................................................478
23.4.1 Quick test.....................................................................................................................................................478
23.4.2 Byte test........................................................................................................................................................479
23.5 Backup reset generator..................................................................................................................................................480
23.6 Generated resets and interrupts.....................................................................................................................................480
23.7 Memory map and register definition.............................................................................................................................481
23.7.1 Watchdog Status and Control Register High (WDOG_STCTRLH)...........................................................482
23.7.2 Watchdog Status and Control Register Low (WDOG_STCTRLL)............................................................483
23.7.3 Watchdog Time-out Value Register High (WDOG_TOVALH).................................................................484
23.7.4 Watchdog Time-out Value Register Low (WDOG_TOVALL)..................................................................484
23.7.5 Watchdog Window Register High (WDOG_WINH)..................................................................................485
23.7.6 Watchdog Window Register Low (WDOG_WINL)...................................................................................485
23.7.7 Watchdog Refresh register (WDOG_REFRESH).......................................................................................486
23.7.8 Watchdog Unlock register (WDOG_UNLOCK).........................................................................................486
23.7.9 Watchdog Timer Output Register High (WDOG_TMROUTH).................................................................486
23.7.10 Watchdog Timer Output Register Low (WDOG_TMROUTL)..................................................................487
K51 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)..................................................................................487
23.7.12 Watchdog Prescaler register (WDOG_PRESC)..........................................................................................488
23.8 Watchdog operation with 8-bit access..........................................................................................................................488
23.8.1 General guideline.........................................................................................................................................488
23.8.2 Refresh and unlock operations with 8-bit access.........................................................................................488
23.9 Restrictions on watchdog operation..............................................................................................................................489
Chapter 24
Multipurpose Clock Generator (MCG)
24.1 Introduction...................................................................................................................................................................493
24.1.1 Features........................................................................................................................................................493
24.1.2 Modes of Operation.....................................................................................................................................497
24.2 External Signal Description..........................................................................................................................................497
24.3 Memory Map/Register Definition.................................................................................................................................497
24.3.1 MCG Control 1 Register (MCG_C1)...........................................................................................................498
24.3.2 MCG Control 2 Register (MCG_C2)...........................................................................................................499
24.3.3 MCG Control 3 Register (MCG_C3)...........................................................................................................500
24.3.4 MCG Control 4 Register (MCG_C4)...........................................................................................................501
24.3.5 MCG Control 5 Register (MCG_C5)...........................................................................................................502
24.3.6 MCG Control 6 Register (MCG_C6)...........................................................................................................503
24.3.7 MCG Status Register (MCG_S)..................................................................................................................505
24.3.8 MCG Status and Control Register (MCG_SC)............................................................................................506
24.3.9 MCG Auto Trim Compare Value High Register (MCG_ATCVH)............................................................508
24.3.10 MCG Auto Trim Compare Value Low Register (MCG_ATCVL)..............................................................508
24.3.11 MCG Control 7 Register (MCG_C7)...........................................................................................................508
24.3.12 MCG Control 8 Register (MCG_C8)...........................................................................................................509
24.4 Functional description...................................................................................................................................................510
24.4.1 MCG mode state diagram............................................................................................................................510
24.4.2 Low Power Bit Usage..................................................................................................................................515
K51 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc. 19
Section number Title Page
24.4.3 MCG Internal Reference Clocks..................................................................................................................515
24.4.4 External Reference Clock............................................................................................................................515
24.4.5 MCG Fixed frequency clock .......................................................................................................................516
24.4.6 MCG PLL clock ..........................................................................................................................................516
24.4.7 MCG Auto TRIM (ATM)............................................................................................................................517
24.5 Initialization / Application information........................................................................................................................518
24.5.1 MCG module initialization sequence...........................................................................................................518
24.5.2 Using a 32.768 kHz reference......................................................................................................................520
24.5.3 MCG mode switching..................................................................................................................................521
Chapter 25
Oscillator (OSC)
25.1 Introduction...................................................................................................................................................................531
25.2 Features and Modes......................................................................................................................................................531
25.3 Block Diagram..............................................................................................................................................................532
25.4 OSC Signal Descriptions..............................................................................................................................................532
25.5 External Crystal / Resonator Connections....................................................................................................................533
25.6 External Clock Connections.........................................................................................................................................534
25.7 Memory Map/Register Definitions...............................................................................................................................535
25.7.1 OSC Memory Map/Register Definition.......................................................................................................535
25.8 Functional Description..................................................................................................................................................536
25.8.1 OSC Module States......................................................................................................................................536
25.8.2 OSC Module Modes.....................................................................................................................................538
25.8.3 Counter.........................................................................................................................................................540
25.8.4 Reference Clock Pin Requirements.............................................................................................................540
25.9 Reset..............................................................................................................................................................................540
25.10 Low Power Modes Operation.......................................................................................................................................541
25.11 Interrupts.......................................................................................................................................................................541
K51 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
20 Freescale Semiconductor, Inc.
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NXP K51_72 Reference guide

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Reference guide

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