NXP K20_100 Reference guide

Type
Reference guide
K20 Sub-Family Reference Manual
Supports: MK20DN512ZCAB10R, MK20DN512ZAB10R
Document Number: K20P120M100SF2RM
Rev. 6.1, Aug 2012
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Contents
Section number Title Page
Chapter 1
About This Document
1.1 Overview.......................................................................................................................................................................53
1.1.1 Purpose.........................................................................................................................................................53
1.1.2 Audience......................................................................................................................................................53
1.2 Conventions..................................................................................................................................................................53
1.2.1 Numbering systems......................................................................................................................................53
1.2.2 Typographic notation...................................................................................................................................54
1.2.3 Special terms................................................................................................................................................54
Chapter 2
Introduction
2.1 Overview.......................................................................................................................................................................55
2.2 Module Functional Categories......................................................................................................................................55
2.2.1 ARM Cortex-M4 Core Modules..................................................................................................................56
2.2.2 System Modules...........................................................................................................................................57
2.2.3 Memories and Memory Interfaces...............................................................................................................58
2.2.4 Clocks...........................................................................................................................................................58
2.2.5 Security and Integrity modules....................................................................................................................59
2.2.6 Analog modules...........................................................................................................................................59
2.2.7 Timer modules.............................................................................................................................................60
2.2.8 Communication interfaces...........................................................................................................................61
2.2.9 Human-machine interfaces..........................................................................................................................62
2.3 Orderable part numbers.................................................................................................................................................62
Chapter 3
Chip Configuration
3.1 Introduction...................................................................................................................................................................63
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3.2 Core modules................................................................................................................................................................63
3.2.1 ARM Cortex-M4 Core Configuration..........................................................................................................63
3.2.2 Nested Vectored Interrupt Controller (NVIC) Configuration......................................................................65
3.2.3 Asynchronous Wake-up Interrupt Controller (AWIC) Configuration.........................................................71
3.2.4 JTAG Controller Configuration...................................................................................................................73
3.3 System modules............................................................................................................................................................73
3.3.1 SIM Configuration.......................................................................................................................................73
3.3.2 Mode Controller Configuration...................................................................................................................74
3.3.3 PMC Configuration......................................................................................................................................75
3.3.4 Low-Leakage Wake-up Unit (LLWU) Configuration.................................................................................75
3.3.5 MCM Configuration....................................................................................................................................77
3.3.6 Crossbar Switch Configuration....................................................................................................................78
3.3.7 Memory Protection Unit (MPU) Configuration...........................................................................................80
3.3.8 Peripheral Bridge Configuration..................................................................................................................83
3.3.9 DMA request multiplexer configuration......................................................................................................85
3.3.10 DMA Controller Configuration...................................................................................................................88
3.3.11 External Watchdog Monitor (EWM) Configuration....................................................................................88
3.3.12 Watchdog Configuration..............................................................................................................................90
3.4 Clock modules..............................................................................................................................................................91
3.4.1 MCG Configuration.....................................................................................................................................91
3.4.2 OSC Configuration......................................................................................................................................92
3.4.3 RTC OSC configuration...............................................................................................................................93
3.5 Memories and memory interfaces.................................................................................................................................93
3.5.1 Flash Memory Configuration.......................................................................................................................93
3.5.2 Flash Memory Controller Configuration.....................................................................................................96
3.5.3 SRAM Configuration...................................................................................................................................97
3.5.4 SRAM Controller Configuration.................................................................................................................100
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3.5.5 System Register File Configuration.............................................................................................................101
3.5.6 VBAT Register File Configuration..............................................................................................................101
3.5.7 EzPort Configuration...................................................................................................................................102
3.5.8 FlexBus Configuration.................................................................................................................................103
3.6 Security.........................................................................................................................................................................106
3.6.1 CRC Configuration......................................................................................................................................106
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3.7 Analog...........................................................................................................................................................................107
3.7.1 16-bit SAR ADC with PGA Configuration.................................................................................................107
3.7.2 CMP Configuration......................................................................................................................................115
3.7.3 12-bit DAC Configuration...........................................................................................................................117
3.7.4 VREF Configuration....................................................................................................................................118
3.8 Timers...........................................................................................................................................................................119
3.8.1 PDB Configuration......................................................................................................................................119
3.8.2 FlexTimer Configuration.............................................................................................................................122
3.8.3 PIT Configuration........................................................................................................................................126
3.8.4 Low-power timer configuration...................................................................................................................127
3.8.5 CMT Configuration......................................................................................................................................128
3.8.6 RTC configuration.......................................................................................................................................129
3.9 Communication interfaces............................................................................................................................................130
3.9.1 Universal Serial Bus (USB) FS Subsystem.................................................................................................131
3.9.2 CAN Configuration......................................................................................................................................136
3.9.3 SPI configuration.........................................................................................................................................138
3.9.4 I2C Configuration........................................................................................................................................141
3.9.5 UART Configuration...................................................................................................................................142
3.9.6 SDHC Configuration....................................................................................................................................145
3.9.7 I2S configuration..........................................................................................................................................146
3.10 Human-machine interfaces...........................................................................................................................................148
3.10.1 GPIO configuration......................................................................................................................................148
3.10.2 TSI Configuration........................................................................................................................................149
Chapter 4
Memory Map
4.1 Introduction...................................................................................................................................................................153
4.2 System memory map.....................................................................................................................................................153
4.2.1 Aliased bit-band regions..............................................................................................................................154
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4.3 Flash Memory Map.......................................................................................................................................................155
4.3.1 Alternate Non-Volatile IRC User Trim Description....................................................................................156
4.4 SRAM memory map.....................................................................................................................................................156
4.5 Peripheral bridge (AIPS-Lite0 and AIPS-Lite1) memory maps...................................................................................156
4.5.1 Peripheral Bridge 0 (AIPS-Lite 0) Memory Map........................................................................................157
4.5.2 Peripheral Bridge 1 (AIPS-Lite 1) Memory Map........................................................................................160
4.6 Private Peripheral Bus (PPB) memory map..................................................................................................................164
Chapter 5
Clock Distribution
5.1 Introduction...................................................................................................................................................................165
5.2 Programming model......................................................................................................................................................165
5.3 High-Level device clocking diagram............................................................................................................................165
5.4 Clock definitions...........................................................................................................................................................166
5.4.1 Device clock summary.................................................................................................................................167
5.5 Internal clocking requirements.....................................................................................................................................169
5.5.1 Clock divider values after reset....................................................................................................................170
5.5.2 VLPR mode clocking...................................................................................................................................170
5.6 Clock Gating.................................................................................................................................................................171
5.7 Module clocks...............................................................................................................................................................171
5.7.1 PMC 1-kHz LPO clock................................................................................................................................173
5.7.2 WDOG clocking..........................................................................................................................................173
5.7.3 Debug trace clock.........................................................................................................................................173
5.7.4 PORT digital filter clocking.........................................................................................................................174
5.7.5 LPTMR clocking..........................................................................................................................................174
5.7.6 USB FS OTG Controller clocking...............................................................................................................175
5.7.7 FlexCAN clocking.......................................................................................................................................176
5.7.8 UART clocking............................................................................................................................................176
5.7.9 SDHC clocking............................................................................................................................................176
5.7.10 I2S clocking.................................................................................................................................................177
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5.7.11 TSI clocking.................................................................................................................................................177
Chapter 6
Reset and Boot
6.1 Introduction...................................................................................................................................................................179
6.2 Reset..............................................................................................................................................................................179
6.2.1 Power-on reset (POR)..................................................................................................................................180
6.2.2 System resets................................................................................................................................................180
6.2.3 Debug resets.................................................................................................................................................183
6.3 Boot...............................................................................................................................................................................185
6.3.1 Boot sources.................................................................................................................................................185
6.3.2 Boot options.................................................................................................................................................185
6.3.3 FOPT boot options.......................................................................................................................................185
6.3.4 Boot sequence..............................................................................................................................................186
Chapter 7
Power Management
7.1 Introduction...................................................................................................................................................................189
7.2 Power modes.................................................................................................................................................................189
7.3 Entering and exiting power modes...............................................................................................................................191
7.4 Power mode transitions.................................................................................................................................................192
7.5 Power modes shutdown sequencing.............................................................................................................................193
7.6 Module Operation in Low Power Modes......................................................................................................................193
7.7 Clock Gating.................................................................................................................................................................196
Chapter 8
Security
8.1 Introduction...................................................................................................................................................................197
8.2 Flash Security...............................................................................................................................................................197
8.3 Security Interactions with other Modules.....................................................................................................................198
8.3.1 Security interactions with FlexBus..............................................................................................................198
8.3.2 Security Interactions with EzPort................................................................................................................198
8.3.3 Security Interactions with Debug.................................................................................................................198
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Chapter 9
Debug
9.1 Introduction...................................................................................................................................................................201
9.1.1 References....................................................................................................................................................203
9.2 The Debug Port.............................................................................................................................................................203
9.2.1 JTAG-to-SWD change sequence.................................................................................................................204
9.2.2 JTAG-to-cJTAG change sequence...............................................................................................................204
9.3 Debug Port Pin Descriptions.........................................................................................................................................205
9.4 System TAP connection................................................................................................................................................205
9.4.1 IR Codes.......................................................................................................................................................205
9.5 JTAG status and control registers.................................................................................................................................206
9.5.1 MDM-AP Control Register..........................................................................................................................207
9.5.2 MDM-AP Status Register............................................................................................................................209
9.6 Debug Resets................................................................................................................................................................210
9.7 AHB-AP........................................................................................................................................................................211
9.8 ITM...............................................................................................................................................................................212
9.9 Core Trace Connectivity...............................................................................................................................................212
9.10 Embedded Trace Macrocell v3.5 (ETM)......................................................................................................................213
9.11 Coresight Embedded Trace Buffer (ETB)....................................................................................................................214
9.11.1 Performance Profiling with the ETB...........................................................................................................214
9.11.2 ETB Counter Control...................................................................................................................................215
9.12 TPIU..............................................................................................................................................................................215
9.13 DWT.............................................................................................................................................................................215
9.14 Debug in Low Power Modes........................................................................................................................................216
9.14.1 Debug Module State in Low Power Modes.................................................................................................217
9.15 Debug & Security.........................................................................................................................................................217
Chapter 10
Signal Multiplexing and Signal Descriptions
10.1 Introduction...................................................................................................................................................................219
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10.2 Signal Multiplexing Integration....................................................................................................................................219
10.2.1 Port control and interrupt module features..................................................................................................220
10.2.2 PCRn reset values for port A.......................................................................................................................220
10.2.3 Clock gating.................................................................................................................................................220
10.2.4 Signal multiplexing constraints....................................................................................................................220
10.3 Pinout............................................................................................................................................................................221
10.3.1 K20 Signal Multiplexing and Pin Assignments...........................................................................................221
10.3.2 K20 Pinouts..................................................................................................................................................225
10.4 Module Signal Description Tables................................................................................................................................226
10.4.1 Core Modules...............................................................................................................................................226
10.4.2 System Modules...........................................................................................................................................227
10.4.3 Clock Modules.............................................................................................................................................228
10.4.4 Memories and Memory Interfaces...............................................................................................................228
10.4.5 Analog..........................................................................................................................................................231
10.4.6 Timer Modules.............................................................................................................................................233
10.4.7 Communication Interfaces...........................................................................................................................235
10.4.8 Human-Machine Interfaces (HMI)..............................................................................................................239
Chapter 11
Port control and interrupts (PORT)
11.1 Introduction...................................................................................................................................................................241
11.2 Overview.......................................................................................................................................................................241
11.2.1 Features........................................................................................................................................................241
11.2.2 Modes of operation......................................................................................................................................242
11.3 External signal description............................................................................................................................................243
11.4 Detailed signal description............................................................................................................................................243
11.5 Memory map and register definition.............................................................................................................................243
11.5.1 Pin Control Register n (PORTx_PCRn).......................................................................................................249
11.5.2 Global Pin Control Low Register (PORTx_GPCLR)..................................................................................251
11.5.3 Global Pin Control High Register (PORTx_GPCHR).................................................................................252
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11.5.4 Interrupt Status Flag Register (PORTx_ISFR)............................................................................................253
11.6 Functional description...................................................................................................................................................253
11.6.1 Pin control....................................................................................................................................................253
11.6.2 Global pin control........................................................................................................................................254
11.6.3 External interrupts........................................................................................................................................254
Chapter 12
System integration module (SIM)
12.1 Introduction...................................................................................................................................................................257
12.1.1 Features........................................................................................................................................................257
12.1.2 Modes of operation......................................................................................................................................257
12.1.3 SIM Signal Descriptions..............................................................................................................................258
12.2 Memory map and register definition.............................................................................................................................258
12.2.1 System Options Register 1 (SIM_SOPT1)..................................................................................................260
12.2.2 System Options Register 2 (SIM_SOPT2)..................................................................................................262
12.2.3 System Options Register 4 (SIM_SOPT4)..................................................................................................264
12.2.4 System Options Register 5 (SIM_SOPT5)..................................................................................................266
12.2.5 System Options Register 6 (SIM_SOPT6)..................................................................................................268
12.2.6 System Options Register 7 (SIM_SOPT7)..................................................................................................269
12.2.7 System Device Identification Register (SIM_SDID)...................................................................................271
12.2.8 System Clock Gating Control Register 1 (SIM_SCGC1)............................................................................272
12.2.9 System Clock Gating Control Register 2 (SIM_SCGC2)............................................................................273
12.2.10 System Clock Gating Control Register 3 (SIM_SCGC3)............................................................................274
12.2.11 System Clock Gating Control Register 4 (SIM_SCGC4)............................................................................276
12.2.12 System Clock Gating Control Register 5 (SIM_SCGC5)............................................................................278
12.2.13 System Clock Gating Control Register 6 (SIM_SCGC6)............................................................................280
12.2.14 System Clock Gating Control Register 7 (SIM_SCGC7)............................................................................282
12.2.15 System Clock Divider Register 1 (SIM_CLKDIV1)...................................................................................283
12.2.16 System Clock Divider Register 2 (SIM_CLKDIV2)...................................................................................286
12.2.17 Flash Configuration Register 1 (SIM_FCFG1)...........................................................................................287
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12.2.18 Flash Configuration Register 2 (SIM_FCFG2)...........................................................................................289
12.2.19 Unique Identification Register High (SIM_UIDH).....................................................................................290
12.2.20 Unique Identification Register Mid-High (SIM_UIDMH)..........................................................................291
12.2.21 Unique Identification Register Mid Low (SIM_UIDML)...........................................................................291
12.2.22 Unique Identification Register Low (SIM_UIDL)......................................................................................292
12.3 Functional description...................................................................................................................................................292
Chapter 13
Mode Controller
13.1 Introduction...................................................................................................................................................................293
13.1.1 Features........................................................................................................................................................293
13.1.2 Modes of Operation.....................................................................................................................................294
13.1.3 MCU Reset...................................................................................................................................................304
13.2 Mode Control Memory Map/Register Definition.........................................................................................................307
13.2.1 System Reset Status Register High (MC_SRSH)........................................................................................308
13.2.2 System Reset Status Register Low (MC_SRSL).........................................................................................309
13.2.3 Power Mode Protection Register (MC_PMPROT).....................................................................................310
13.2.4 Power Mode Control Register (MC_PMCTRL)..........................................................................................312
Chapter 14
Power Management Controller
14.1 Introduction...................................................................................................................................................................315
14.2 Features.........................................................................................................................................................................315
14.3 Low-Voltage Detect (LVD) System.............................................................................................................................315
14.3.1 LVD Reset Operation...................................................................................................................................316
14.3.2 LVD Interrupt Operation.............................................................................................................................316
14.3.3 Low-Voltage Warning (LVW) Interrupt Operation.....................................................................................316
14.4 PMC Memory Map/Register Definition.......................................................................................................................317
14.4.1 Low Voltage Detect Status and Control 1 Register (PMC_LVDSC1)........................................................317
14.4.2 Low Voltage Detect Status and Control 2 Register (PMC_LVDSC2)........................................................318
14.4.3 Regulator Status and Control Register (PMC_REGSC)..............................................................................320
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Chapter 15
Low-leakage wake-up unit (LLWU)
15.1 Introduction...................................................................................................................................................................321
15.1.1 Features........................................................................................................................................................322
15.1.2 Modes of operation......................................................................................................................................322
15.1.3 Block diagram..............................................................................................................................................323
15.2 LLWU Signal Descriptions...........................................................................................................................................324
15.3 Memory map/register definition...................................................................................................................................325
15.3.1 LLWU Pin Enable 1 Register (LLWU_PE1)..............................................................................................325
15.3.2 LLWU Pin Enable 2 Register (LLWU_PE2)..............................................................................................326
15.3.3 LLWU Pin Enable 3 Register (LLWU_PE3)..............................................................................................327
15.3.4 LLWU Pin Enable 4 Register (LLWU_PE4)..............................................................................................328
15.3.5 LLWU Module Enable Register (LLWU_ME)...........................................................................................329
15.3.6 LLWU Flag 1 Register (LLWU_F1)...........................................................................................................331
15.3.7 LLWU Flag 2 Register (LLWU_F2)...........................................................................................................332
15.3.8 LLWU Flag 3 Register (LLWU_F3)...........................................................................................................334
15.3.9 LLWU Control and Status Register (LLWU_CS).......................................................................................336
15.4 Functional description...................................................................................................................................................337
15.4.1 LLS mode.....................................................................................................................................................337
15.4.2 VLLS modes................................................................................................................................................338
15.4.3 Initialization.................................................................................................................................................338
15.4.4 Low power mode recovery..........................................................................................................................338
Chapter 16
Miscellaneous Control Module (MCM)
16.1 Introduction...................................................................................................................................................................341
16.1.1 Features........................................................................................................................................................341
16.2 Memory map/register descriptions...............................................................................................................................341
16.2.1 Crossbar Switch (AXBS) Slave Configuration (MCM_PLASC)................................................................342
16.2.2 Crossbar Switch (AXBS) Master Configuration (MCM_PLAMC)............................................................343
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16.2.3 SRAM arbitration and protection (MCM_SRAMAP).................................................................................343
16.2.4 Interrupt Status Register (MCM_ISR).........................................................................................................345
16.2.5 ETB Counter Control register (MCM_ETBCC)..........................................................................................346
16.2.6 ETB Reload register (MCM_ETBRL).........................................................................................................347
16.2.7 ETB Counter Value register (MCM_ETBCNT)..........................................................................................347
16.3 Functional description...................................................................................................................................................348
16.3.1 Interrupts......................................................................................................................................................348
Chapter 17
Crossbar Switch (AXBS)
17.1 Introduction...................................................................................................................................................................349
17.1.1 Features........................................................................................................................................................349
17.2 Memory Map / Register Definition...............................................................................................................................350
17.2.1 Priority Registers Slave (AXBS_PRSn)......................................................................................................351
17.2.2 Control Register (AXBS_CRSn).................................................................................................................354
17.2.3 Master General Purpose Control Register (AXBS_MGPCRn)...................................................................355
17.3 Functional Description..................................................................................................................................................356
17.3.1 General operation.........................................................................................................................................356
17.3.2 Register coherency.......................................................................................................................................357
17.3.3 Arbitration....................................................................................................................................................357
17.4 Initialization/application information...........................................................................................................................360
Chapter 18
Memory Protection Unit (MPU)
18.1 Introduction...................................................................................................................................................................361
18.2 Overview.......................................................................................................................................................................361
18.2.1 Block diagram..............................................................................................................................................361
18.2.2 Features........................................................................................................................................................362
18.3 Memory map/register definition...................................................................................................................................363
18.3.1 Control/Error Status Register (MPU_CESR)..............................................................................................366
18.3.2 Error Address Register, slave port n (MPU_EARn)....................................................................................367
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18.3.3 Error Detail Register, slave port n (MPU_EDRn).......................................................................................368
18.3.4 Region Descriptor n, Word 0 (MPU_RGDn_WORD0)..............................................................................369
18.3.5 Region Descriptor n, Word 1 (MPU_RGDn_WORD1)..............................................................................370
18.3.6 Region Descriptor n, Word 2 (MPU_RGDn_WORD2)..............................................................................370
18.3.7 Region Descriptor n, Word 3 (MPU_RGDn_WORD3)..............................................................................373
18.3.8 Region Descriptor Alternate Access Control n (MPU_RGDAACn)...........................................................374
18.4 Functional description...................................................................................................................................................376
18.4.1 Access evaluation macro..............................................................................................................................376
18.4.2 Putting it all together and error terminations...............................................................................................377
18.4.3 Power management......................................................................................................................................378
18.5 Initialization information..............................................................................................................................................378
18.6 Application information................................................................................................................................................378
Chapter 19
Peripheral Bridge (AIPS-Lite)
19.1 Introduction...................................................................................................................................................................381
19.1.1 Features........................................................................................................................................................381
19.1.2 General operation.........................................................................................................................................381
19.2 Memory map/register definition...................................................................................................................................382
19.2.1 Master Privilege Register A (AIPSx_MPRA).............................................................................................383
19.2.2 Peripheral Access Control Register (AIPSx_PACRn).................................................................................387
19.2.3 Peripheral Access Control Register (AIPSx_PACRn).................................................................................392
19.3 Functional description...................................................................................................................................................397
19.3.1 Access support.............................................................................................................................................397
Chapter 20
Direct Memory Access Multiplexer (DMAMUX)
20.1 Introduction...................................................................................................................................................................399
20.1.1 Overview......................................................................................................................................................399
20.1.2 Features........................................................................................................................................................400
20.1.3 Modes of operation......................................................................................................................................400
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20.2 External signal description............................................................................................................................................401
20.3 Memory map/register definition...................................................................................................................................401
20.3.1 Channel Configuration register (DMAMUX_CHCFGn)............................................................................402
20.4 Functional description...................................................................................................................................................403
20.4.1 DMA channels with periodic triggering capability......................................................................................403
20.4.2 DMA channels with no triggering capability...............................................................................................405
20.4.3 Always-enabled DMA sources....................................................................................................................405
20.5 Initialization/application information...........................................................................................................................407
20.5.1 Reset.............................................................................................................................................................407
20.5.2 Enabling and configuring sources................................................................................................................407
Chapter 21
Direct Memory Access Controller (eDMA)
21.1 Introduction...................................................................................................................................................................411
21.1.1 Block diagram..............................................................................................................................................411
21.1.2 Block parts...................................................................................................................................................412
21.1.3 Features........................................................................................................................................................413
21.2 Modes of operation.......................................................................................................................................................415
21.3 Memory map/register definition...................................................................................................................................415
21.3.1 Control Register (DMA_CR).......................................................................................................................426
21.3.2 Error Status Register (DMA_ES)................................................................................................................428
21.3.3 Enable Request Register (DMA_ERQ).......................................................................................................430
21.3.4 Enable Error Interrupt Register (DMA_EEI)...............................................................................................432
21.3.5 Clear Enable Error Interrupt Register (DMA_CEEI)..................................................................................434
21.3.6 Set Enable Error Interrupt Register (DMA_SEEI)......................................................................................435
21.3.7 Clear Enable Request Register (DMA_CERQ)...........................................................................................436
21.3.8 Set Enable Request Register (DMA_SERQ)...............................................................................................437
21.3.9 Clear DONE Status Bit Register (DMA_CDNE)........................................................................................438
21.3.10 Set START Bit Register (DMA_SSRT)......................................................................................................439
21.3.11 Clear Error Register (DMA_CERR)............................................................................................................440
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21.3.12 Clear Interrupt Request Register (DMA_CINT).........................................................................................441
21.3.13 Interrupt Request Register (DMA_INT)......................................................................................................442
21.3.14 Error Register (DMA_ERR)........................................................................................................................444
21.3.15 Hardware Request Status Register (DMA_HRS)........................................................................................447
21.3.16 Channel n Priority Register (DMA_DCHPRIn)..........................................................................................449
21.3.17 TCD Source Address (DMA_TCDn_SADDR)...........................................................................................450
21.3.18 TCD Signed Source Address Offset (DMA_TCDn_SOFF)........................................................................450
21.3.19 TCD Transfer Attributes (DMA_TCDn_ATTR).........................................................................................451
21.3.20 TCD Minor Byte Count (Minor Loop Disabled) (DMA_TCDn_NBYTES_MLNO).................................452
21.3.21 TCD Signed Minor Loop Offset (Minor Loop Enabled and Offset Disabled)
(DMA_TCDn_NBYTES_MLOFFNO).......................................................................................................452
21.3.22 TCD Signed Minor Loop Offset (Minor Loop and Offset Enabled)
(DMA_TCDn_NBYTES_MLOFFYES).....................................................................................................453
21.3.23 TCD Last Source Address Adjustment (DMA_TCDn_SLAST).................................................................455
21.3.24 TCD Destination Address (DMA_TCDn_DADDR)...................................................................................455
21.3.25 TCD Signed Destination Address Offset (DMA_TCDn_DOFF)................................................................456
21.3.26 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_CITER_ELINKYES)...........................................................................................................456
21.3.27 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_CITER_ELINKNO)............................................................................................................457
21.3.28 TCD Last Destination Address Adjustment/Scatter Gather Address (DMA_TCDn_DLASTSGA)..........458
21.3.29 TCD Control and Status (DMA_TCDn_CSR)............................................................................................459
21.3.30 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_BITER_ELINKYES)...........................................................................................................461
21.3.31 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_BITER_ELINKNO)............................................................................................................462
21.4 Functional description...................................................................................................................................................463
21.4.1 eDMA basic data flow.................................................................................................................................463
21.4.2 Error reporting and handling........................................................................................................................466
21.4.3 Channel preemption.....................................................................................................................................468
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21.4.4 Performance.................................................................................................................................................468
21.5 Initialization/application information...........................................................................................................................473
21.5.1 eDMA initialization.....................................................................................................................................473
21.5.2 Programming errors.....................................................................................................................................475
21.5.3 Arbitration mode considerations..................................................................................................................475
21.5.4 Performing DMA transfers (examples)........................................................................................................476
21.5.5 Monitoring transfer descriptor status...........................................................................................................480
21.5.6 Channel Linking...........................................................................................................................................481
21.5.7 Dynamic programming................................................................................................................................483
Chapter 22
External Watchdog Monitor (EWM)
22.1 Introduction...................................................................................................................................................................487
22.1.1 Features........................................................................................................................................................487
22.1.2 Modes of Operation.....................................................................................................................................488
22.1.3 Block Diagram.............................................................................................................................................489
22.2 EWM Signal Descriptions............................................................................................................................................490
22.3 Memory Map/Register Definition.................................................................................................................................490
22.3.1 Control Register (EWM_CTRL).................................................................................................................490
22.3.2 Service Register (EWM_SERV)..................................................................................................................491
22.3.3 Compare Low Register (EWM_CMPL)......................................................................................................491
22.3.4 Compare High Register (EWM_CMPH).....................................................................................................492
22.4 Functional Description..................................................................................................................................................493
22.4.1 The EWM_out Signal..................................................................................................................................493
22.4.2 The EWM_in Signal....................................................................................................................................494
22.4.3 EWM Counter..............................................................................................................................................494
22.4.4 EWM Compare Registers............................................................................................................................494
22.4.5 EWM Refresh Mechanism...........................................................................................................................495
K20 Sub-Family Reference Manual, Rev. 6.1, Aug 2012
18 Freescale Semiconductor, Inc.
Section number Title Page
Chapter 23
Watchdog Timer (WDOG)
23.1 Introduction...................................................................................................................................................................497
23.2 Features.........................................................................................................................................................................497
23.3 Functional overview......................................................................................................................................................499
23.3.1 Unlocking and updating the watchdog.........................................................................................................500
23.3.2 Watchdog configuration time (WCT)..........................................................................................................501
23.3.3 Refreshing the watchdog..............................................................................................................................502
23.3.4 Windowed mode of operation......................................................................................................................502
23.3.5 Watchdog disabled mode of operation.........................................................................................................502
23.3.6 Low-power modes of operation...................................................................................................................503
23.3.7 Debug modes of operation...........................................................................................................................503
23.4 Testing the watchdog....................................................................................................................................................504
23.4.1 Quick test.....................................................................................................................................................504
23.4.2 Byte test........................................................................................................................................................505
23.5 Backup reset generator..................................................................................................................................................506
23.6 Generated resets and interrupts.....................................................................................................................................506
23.7 Memory map and register definition.............................................................................................................................507
23.7.1 Watchdog Status and Control Register High (WDOG_STCTRLH)...........................................................508
23.7.2 Watchdog Status and Control Register Low (WDOG_STCTRLL)............................................................509
23.7.3 Watchdog Time-out Value Register High (WDOG_TOVALH).................................................................510
23.7.4 Watchdog Time-out Value Register Low (WDOG_TOVALL)..................................................................510
23.7.5 Watchdog Window Register High (WDOG_WINH)..................................................................................511
23.7.6 Watchdog Window Register Low (WDOG_WINL)...................................................................................511
23.7.7 Watchdog Refresh register (WDOG_REFRESH).......................................................................................512
23.7.8 Watchdog Unlock register (WDOG_UNLOCK).........................................................................................512
23.7.9 Watchdog Timer Output Register High (WDOG_TMROUTH).................................................................512
23.7.10 Watchdog Timer Output Register Low (WDOG_TMROUTL)..................................................................513
23.7.11 Watchdog Reset Count register (WDOG_RSTCNT)..................................................................................513
K20 Sub-Family Reference Manual, Rev. 6.1, Aug 2012
Freescale Semiconductor, Inc. 19
Section number Title Page
23.7.12 Watchdog Prescaler register (WDOG_PRESC)..........................................................................................514
23.8 Watchdog operation with 8-bit access..........................................................................................................................514
23.8.1 General guideline.........................................................................................................................................514
23.8.2 Refresh and unlock operations with 8-bit access.........................................................................................514
23.9 Restrictions on watchdog operation..............................................................................................................................515
Chapter 24
Multipurpose Clock Generator (MCG)
24.1 Introduction...................................................................................................................................................................519
24.1.1 Features........................................................................................................................................................519
24.1.2 Modes of Operation.....................................................................................................................................523
24.2 External Signal Description..........................................................................................................................................523
24.3 Memory Map/Register Definition.................................................................................................................................523
24.3.1 MCG Control 1 Register (MCG_C1)...........................................................................................................524
24.3.2 MCG Control 2 Register (MCG_C2)...........................................................................................................525
24.3.3 MCG Control 3 Register (MCG_C3)...........................................................................................................526
24.3.4 MCG Control 4 Register (MCG_C4)...........................................................................................................527
24.3.5 MCG Control 5 Register (MCG_C5)...........................................................................................................528
24.3.6 MCG Control 6 Register (MCG_C6)...........................................................................................................529
24.3.7 MCG Status Register (MCG_S)..................................................................................................................531
24.3.8 MCG Auto Trim Control Register (MCG_ATC)........................................................................................532
24.3.9 MCG Auto Trim Compare Value High Register (MCG_ATCVH)............................................................533
24.3.10 MCG Auto Trim Compare Value Low Register (MCG_ATCVL)..............................................................533
24.3.11 MCG Control 7 Register (MCG_C7)...........................................................................................................534
24.3.12 MCG Control 8 Register (MCG_C8)...........................................................................................................534
24.3.13 MCG Control 9 Register (MCG_C9)...........................................................................................................535
24.3.14 MCG Control 10 Register (MCG_C10).......................................................................................................536
24.4 Functional Description..................................................................................................................................................536
24.4.1 MCG mode state diagram............................................................................................................................536
24.4.2 Low Power Bit Usage..................................................................................................................................541
K20 Sub-Family Reference Manual, Rev. 6.1, Aug 2012
20 Freescale Semiconductor, Inc.
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NXP K20_100 Reference guide

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Reference guide

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