NXP K20_100 Reference guide

Type
Reference guide
K20 Sub-Family Reference Manual
Supports: MK20DX256VLL10, MK20DN512VLL10
Document Number: K20P100M100SF2V2RM
Rev. 2 Jun 2012
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Contents
Section number Title Page
Chapter 1
About This Document
1.1 Overview.......................................................................................................................................................................55
1.1.1 Purpose.........................................................................................................................................................55
1.1.2 Audience......................................................................................................................................................55
1.2 Conventions..................................................................................................................................................................55
1.2.1 Numbering systems......................................................................................................................................55
1.2.2 Typographic notation...................................................................................................................................56
1.2.3 Special terms................................................................................................................................................56
Chapter 2
Introduction
2.1 Overview.......................................................................................................................................................................57
2.2 Module Functional Categories......................................................................................................................................57
2.2.1 ARM Cortex-M4 Core Modules..................................................................................................................58
2.2.2 System Modules...........................................................................................................................................59
2.2.3 Memories and Memory Interfaces...............................................................................................................60
2.2.4 Clocks...........................................................................................................................................................60
2.2.5 Security and Integrity modules....................................................................................................................61
2.2.6 Analog modules...........................................................................................................................................61
2.2.7 Timer modules.............................................................................................................................................62
2.2.8 Communication interfaces...........................................................................................................................63
2.2.9 Human-machine interfaces..........................................................................................................................64
2.3 Orderable part numbers.................................................................................................................................................64
Chapter 3
Chip Configuration
3.1 Introduction...................................................................................................................................................................65
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3.2 Core modules................................................................................................................................................................65
3.2.1 ARM Cortex-M4 Core Configuration..........................................................................................................65
3.2.2 Nested Vectored Interrupt Controller (NVIC) Configuration......................................................................67
3.2.3 Asynchronous Wake-up Interrupt Controller (AWIC) Configuration.........................................................73
3.2.4 JTAG Controller Configuration...................................................................................................................75
3.3 System modules............................................................................................................................................................75
3.3.1 SIM Configuration.......................................................................................................................................75
3.3.2 System Mode Controller (SMC) Configuration...........................................................................................76
3.3.3 PMC Configuration......................................................................................................................................77
3.3.4 Low-Leakage Wake-up Unit (LLWU) Configuration.................................................................................77
3.3.5 MCM Configuration....................................................................................................................................79
3.3.6 Crossbar Switch Configuration....................................................................................................................80
3.3.7 Memory Protection Unit (MPU) Configuration...........................................................................................82
3.3.8 Peripheral Bridge Configuration..................................................................................................................85
3.3.9 DMA request multiplexer configuration......................................................................................................86
3.3.10 DMA Controller Configuration...................................................................................................................89
3.3.11 External Watchdog Monitor (EWM) Configuration....................................................................................90
3.3.12 Watchdog Configuration..............................................................................................................................92
3.4 Clock modules..............................................................................................................................................................93
3.4.1 MCG Configuration.....................................................................................................................................93
3.4.2 OSC Configuration......................................................................................................................................94
3.4.3 RTC OSC configuration...............................................................................................................................95
3.5 Memories and memory interfaces.................................................................................................................................95
3.5.1 Flash Memory Configuration.......................................................................................................................95
3.5.2 Flash Memory Controller Configuration.....................................................................................................98
3.5.3 SRAM Configuration...................................................................................................................................99
3.5.4 SRAM Controller Configuration.................................................................................................................102
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3.5.5 System Register File Configuration.............................................................................................................103
3.5.6 VBAT Register File Configuration..............................................................................................................103
3.5.7 EzPort Configuration...................................................................................................................................104
3.5.8 FlexBus Configuration.................................................................................................................................105
3.6 Security.........................................................................................................................................................................108
3.6.1 CRC Configuration......................................................................................................................................108
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3.7 Analog...........................................................................................................................................................................109
3.7.1 16-bit SAR ADC with PGA Configuration.................................................................................................109
3.7.2 CMP Configuration......................................................................................................................................117
3.7.3 12-bit DAC Configuration...........................................................................................................................119
3.7.4 VREF Configuration....................................................................................................................................120
3.8 Timers...........................................................................................................................................................................121
3.8.1 PDB Configuration......................................................................................................................................121
3.8.2 FlexTimer Configuration.............................................................................................................................124
3.8.3 PIT Configuration........................................................................................................................................128
3.8.4 Low-power timer configuration...................................................................................................................129
3.8.5 CMT Configuration......................................................................................................................................131
3.8.6 RTC configuration.......................................................................................................................................132
3.9 Communication interfaces............................................................................................................................................133
3.9.1 Universal Serial Bus (USB) FS Subsystem.................................................................................................133
3.9.2 CAN Configuration......................................................................................................................................138
3.9.3 SPI configuration.........................................................................................................................................140
3.9.4 I2C Configuration........................................................................................................................................144
3.9.5 UART Configuration...................................................................................................................................144
3.9.6 SDHC Configuration....................................................................................................................................147
3.9.7 I2S configuration..........................................................................................................................................149
3.10 Human-machine interfaces...........................................................................................................................................151
3.10.1 GPIO configuration......................................................................................................................................151
3.10.2 TSI Configuration........................................................................................................................................152
Chapter 4
Memory Map
4.1 Introduction...................................................................................................................................................................155
4.2 System memory map.....................................................................................................................................................155
4.2.1 Aliased bit-band regions..............................................................................................................................156
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4.3 Flash Memory Map.......................................................................................................................................................157
4.3.1 Alternate Non-Volatile IRC User Trim Description....................................................................................158
4.4 SRAM memory map.....................................................................................................................................................158
4.5 Peripheral bridge (AIPS-Lite0 and AIPS-Lite1) memory maps...................................................................................159
4.5.1 Peripheral Bridge 0 (AIPS-Lite 0) Memory Map........................................................................................159
4.5.2 Peripheral Bridge 1 (AIPS-Lite 1) Memory Map........................................................................................163
4.6 Private Peripheral Bus (PPB) memory map..................................................................................................................166
Chapter 5
Clock Distribution
5.1 Introduction...................................................................................................................................................................169
5.2 Programming model......................................................................................................................................................169
5.3 High-Level device clocking diagram............................................................................................................................169
5.4 Clock definitions...........................................................................................................................................................170
5.4.1 Device clock summary.................................................................................................................................171
5.5 Internal clocking requirements.....................................................................................................................................173
5.5.1 Clock divider values after reset....................................................................................................................174
5.5.2 VLPR mode clocking...................................................................................................................................174
5.6 Clock Gating.................................................................................................................................................................175
5.7 Module clocks...............................................................................................................................................................175
5.7.1 PMC 1-kHz LPO clock................................................................................................................................177
5.7.2 WDOG clocking..........................................................................................................................................177
5.7.3 Debug trace clock.........................................................................................................................................177
5.7.4 PORT digital filter clocking.........................................................................................................................178
5.7.5 LPTMR clocking..........................................................................................................................................178
5.7.6 USB FS OTG Controller clocking...............................................................................................................179
5.7.7 FlexCAN clocking.......................................................................................................................................179
5.7.8 UART clocking............................................................................................................................................180
5.7.9 SDHC clocking............................................................................................................................................180
5.7.10 I2S/SAI clocking..........................................................................................................................................181
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5.7.11 TSI clocking.................................................................................................................................................181
Chapter 6
Reset and Boot
6.1 Introduction...................................................................................................................................................................183
6.2 Reset..............................................................................................................................................................................184
6.2.1 Power-on reset (POR)..................................................................................................................................184
6.2.2 System reset sources....................................................................................................................................184
6.2.3 MCU Resets.................................................................................................................................................188
6.2.4 Reset Pin .....................................................................................................................................................190
6.2.5 Debug resets.................................................................................................................................................190
6.3 Boot...............................................................................................................................................................................191
6.3.1 Boot sources.................................................................................................................................................191
6.3.2 Boot options.................................................................................................................................................192
6.3.3 FOPT boot options.......................................................................................................................................192
6.3.4 Boot sequence..............................................................................................................................................193
Chapter 7
Power Management
7.1 Introduction...................................................................................................................................................................195
7.2 Power modes.................................................................................................................................................................195
7.3 Entering and exiting power modes...............................................................................................................................197
7.4 Power mode transitions.................................................................................................................................................198
7.5 Power modes shutdown sequencing.............................................................................................................................199
7.6 Module Operation in Low Power Modes......................................................................................................................199
7.7 Clock Gating.................................................................................................................................................................202
Chapter 8
Security
8.1 Introduction...................................................................................................................................................................203
8.2 Flash Security...............................................................................................................................................................203
8.3 Security Interactions with other Modules.....................................................................................................................204
8.3.1 Security interactions with FlexBus..............................................................................................................204
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8.3.2 Security Interactions with EzPort................................................................................................................204
8.3.3 Security Interactions with Debug.................................................................................................................204
Chapter 9
Debug
9.1 Introduction...................................................................................................................................................................207
9.1.1 References....................................................................................................................................................209
9.2 The Debug Port.............................................................................................................................................................209
9.2.1 JTAG-to-SWD change sequence.................................................................................................................210
9.2.2 JTAG-to-cJTAG change sequence...............................................................................................................210
9.3 Debug Port Pin Descriptions.........................................................................................................................................211
9.4 System TAP connection................................................................................................................................................211
9.4.1 IR Codes.......................................................................................................................................................211
9.5 JTAG status and control registers.................................................................................................................................212
9.5.1 MDM-AP Control Register..........................................................................................................................213
9.5.2 MDM-AP Status Register............................................................................................................................215
9.6 Debug Resets................................................................................................................................................................216
9.7 AHB-AP........................................................................................................................................................................217
9.8 ITM...............................................................................................................................................................................218
9.9 Core Trace Connectivity...............................................................................................................................................218
9.10 Embedded Trace Macrocell v3.5 (ETM)......................................................................................................................219
9.11 Coresight Embedded Trace Buffer (ETB)....................................................................................................................220
9.11.1 Performance Profiling with the ETB...........................................................................................................220
9.11.2 ETB Counter Control...................................................................................................................................221
9.12 TPIU..............................................................................................................................................................................221
9.13 DWT.............................................................................................................................................................................221
9.14 Debug in Low Power Modes........................................................................................................................................222
9.14.1 Debug Module State in Low Power Modes.................................................................................................223
9.15 Debug & Security.........................................................................................................................................................223
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Chapter 10
Signal Multiplexing and Signal Descriptions
10.1 Introduction...................................................................................................................................................................225
10.2 Signal Multiplexing Integration....................................................................................................................................225
10.2.1 Port control and interrupt module features..................................................................................................226
10.2.2 PCRn reset values for port A.......................................................................................................................226
10.2.3 Clock gating.................................................................................................................................................226
10.2.4 Signal multiplexing constraints....................................................................................................................226
10.3 Pinout............................................................................................................................................................................227
10.3.1 K20 Signal Multiplexing and Pin Assignments...........................................................................................227
10.3.2 K20 Pinouts..................................................................................................................................................230
10.4 Module Signal Description Tables................................................................................................................................232
10.4.1 Core Modules...............................................................................................................................................232
10.4.2 System Modules...........................................................................................................................................232
10.4.3 Clock Modules.............................................................................................................................................233
10.4.4 Memories and Memory Interfaces...............................................................................................................233
10.4.5 Analog..........................................................................................................................................................236
10.4.6 Timer Modules.............................................................................................................................................238
10.4.7 Communication Interfaces...........................................................................................................................240
10.4.8 Human-Machine Interfaces (HMI)..............................................................................................................243
Chapter 11
Port control and interrupts (PORT)
11.1 Introduction...................................................................................................................................................................245
11.2 Overview.......................................................................................................................................................................245
11.2.1 Features........................................................................................................................................................245
11.2.2 Modes of operation......................................................................................................................................246
11.3 External signal description............................................................................................................................................247
11.4 Detailed signal description............................................................................................................................................247
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11.5 Memory map and register definition.............................................................................................................................247
11.5.1 Pin Control Register n (PORTx_PCRn).......................................................................................................253
11.5.2 Global Pin Control Low Register (PORTx_GPCLR)..................................................................................256
11.5.3 Global Pin Control High Register (PORTx_GPCHR).................................................................................256
11.5.4 Interrupt Status Flag Register (PORTx_ISFR)............................................................................................257
11.6 Functional description...................................................................................................................................................257
11.6.1 Pin control....................................................................................................................................................257
11.6.2 Global pin control........................................................................................................................................258
11.6.3 External interrupts........................................................................................................................................258
Chapter 12
System Integration Module (SIM)
12.1 Introduction...................................................................................................................................................................261
12.1.1 Features........................................................................................................................................................261
12.2 Memory map and register definition.............................................................................................................................262
12.2.1 System Options Register 1 (SIM_SOPT1)..................................................................................................263
12.2.2 SOPT1 Configuration Register (SIM_SOPT1CFG)....................................................................................265
12.2.3 System Options Register 2 (SIM_SOPT2)..................................................................................................266
12.2.4 System Options Register 4 (SIM_SOPT4)..................................................................................................268
12.2.5 System Options Register 5 (SIM_SOPT5)..................................................................................................271
12.2.6 System Options Register 7 (SIM_SOPT7)..................................................................................................272
12.2.7 System Device Identification Register (SIM_SDID)...................................................................................274
12.2.8 System Clock Gating Control Register 1 (SIM_SCGC1)............................................................................276
12.2.9 System Clock Gating Control Register 2 (SIM_SCGC2)............................................................................277
12.2.10 System Clock Gating Control Register 3 (SIM_SCGC3)............................................................................278
12.2.11 System Clock Gating Control Register 4 (SIM_SCGC4)............................................................................279
12.2.12 System Clock Gating Control Register 5 (SIM_SCGC5)............................................................................282
12.2.13 System Clock Gating Control Register 6 (SIM_SCGC6)............................................................................284
12.2.14 System Clock Gating Control Register 7 (SIM_SCGC7)............................................................................286
12.2.15 System Clock Divider Register 1 (SIM_CLKDIV1)...................................................................................287
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12.2.16 System Clock Divider Register 2 (SIM_CLKDIV2)...................................................................................290
12.2.17 Flash Configuration Register 1 (SIM_FCFG1)...........................................................................................291
12.2.18 Flash Configuration Register 2 (SIM_FCFG2)...........................................................................................293
12.2.19 Unique Identification Register High (SIM_UIDH).....................................................................................294
12.2.20 Unique Identification Register Mid-High (SIM_UIDMH)..........................................................................295
12.2.21 Unique Identification Register Mid Low (SIM_UIDML)...........................................................................295
12.2.22 Unique Identification Register Low (SIM_UIDL)......................................................................................296
12.3 Functional description...................................................................................................................................................296
Chapter 13
Reset Control Module (RCM)
13.1 Introduction...................................................................................................................................................................297
13.2 Reset memory map and register descriptions...............................................................................................................297
13.2.1 System Reset Status Register 0 (RCM_SRS0)............................................................................................297
13.2.2 System Reset Status Register 1 (RCM_SRS1)............................................................................................299
13.2.3 Reset Pin Filter Control register (RCM_RPFC)..........................................................................................300
13.2.4 Reset Pin Filter Width register (RCM_RPFW)...........................................................................................301
13.2.5 Mode Register (RCM_MR).........................................................................................................................303
Chapter 14
System Mode Controller
14.1 Introduction...................................................................................................................................................................305
14.2 Modes of operation.......................................................................................................................................................305
14.3 Memory map and register descriptions.........................................................................................................................307
14.3.1 Power Mode Protection register (SMC_PMPROT).....................................................................................308
14.3.2 Power Mode Control register (SMC_PMCTRL).........................................................................................309
14.3.3 VLLS Control register (SMC_VLLSCTRL)...............................................................................................310
14.3.4 Power Mode Status register (SMC_PMSTAT)...........................................................................................311
14.4 Functional description...................................................................................................................................................312
14.4.1 Power mode transitions................................................................................................................................312
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14.4.2 Power mode entry/exit sequencing..............................................................................................................315
14.4.3 Run modes....................................................................................................................................................317
14.4.4 Wait modes..................................................................................................................................................319
14.4.5 Stop modes...................................................................................................................................................320
14.4.6 Debug in low power modes.........................................................................................................................323
Chapter 15
Power Management Controller
15.1 Introduction...................................................................................................................................................................325
15.2 Features.........................................................................................................................................................................325
15.3 Low-voltage detect (LVD) system................................................................................................................................325
15.3.1 LVD reset operation.....................................................................................................................................326
15.3.2 LVD interrupt operation...............................................................................................................................326
15.3.3 Low-voltage warning (LVW) interrupt operation.......................................................................................326
15.4 I/O retention..................................................................................................................................................................327
15.5 Memory map and register descriptions.........................................................................................................................327
15.5.1 Low Voltage Detect Status And Control 1 register (PMC_LVDSC1)........................................................328
15.5.2 Low Voltage Detect Status And Control 2 register (PMC_LVDSC2)........................................................329
15.5.3 Regulator Status And Control register (PMC_REGSC)..............................................................................330
Chapter 16
Low-Leakage Wakeup Unit (LLWU)
16.1 Introduction...................................................................................................................................................................333
16.1.1 Features........................................................................................................................................................333
16.1.2 Modes of operation......................................................................................................................................334
16.1.3 Block diagram..............................................................................................................................................335
16.2 LLWU signal descriptions............................................................................................................................................336
16.3 Memory map/register definition...................................................................................................................................337
16.3.1 LLWU Pin Enable 1 register (LLWU_PE1)................................................................................................338
16.3.2 LLWU Pin Enable 2 register (LLWU_PE2)................................................................................................339
16.3.3 LLWU Pin Enable 3 register (LLWU_PE3)................................................................................................340
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16.3.4 LLWU Pin Enable 4 register (LLWU_PE4)................................................................................................341
16.3.5 LLWU Module Enable register (LLWU_ME)............................................................................................342
16.3.6 LLWU Flag 1 register (LLWU_F1).............................................................................................................344
16.3.7 LLWU Flag 2 register (LLWU_F2).............................................................................................................345
16.3.8 LLWU Flag 3 register (LLWU_F3).............................................................................................................347
16.3.9 LLWU Pin Filter 1 register (LLWU_FILT1)..............................................................................................349
16.3.10 LLWU Pin Filter 2 register (LLWU_FILT2)..............................................................................................350
16.3.11 LLWU Reset Enable register (LLWU_RST)...............................................................................................351
16.4 Functional description...................................................................................................................................................352
16.4.1 LLS mode.....................................................................................................................................................352
16.4.2 VLLS modes................................................................................................................................................352
16.4.3 Initialization.................................................................................................................................................353
Chapter 17
Miscellaneous Control Module (MCM)
17.1 Introduction...................................................................................................................................................................355
17.1.1 Features........................................................................................................................................................355
17.2 Memory map/register descriptions...............................................................................................................................355
17.2.1 Crossbar Switch (AXBS) Slave Configuration (MCM_PLASC)................................................................356
17.2.2 Crossbar Switch (AXBS) Master Configuration (MCM_PLAMC)............................................................357
17.2.3 Control Register (MCM_CR)......................................................................................................................357
17.2.4 Interrupt Status Register (MCM_ISR).........................................................................................................359
17.2.5 ETB Counter Control register (MCM_ETBCC)..........................................................................................360
17.2.6 ETB Reload register (MCM_ETBRL).........................................................................................................361
17.2.7 ETB Counter Value register (MCM_ETBCNT)..........................................................................................361
17.2.8 Process ID register (MCM_PID).................................................................................................................362
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17.3 Functional description...................................................................................................................................................362
17.3.1 Interrupts......................................................................................................................................................362
Chapter 18
Crossbar Switch (AXBS)
18.1 Introduction...................................................................................................................................................................365
18.1.1 Features........................................................................................................................................................365
18.2 Memory Map / Register Definition...............................................................................................................................366
18.2.1 Priority Registers Slave (AXBS_PRSn)......................................................................................................367
18.2.2 Control Register (AXBS_CRSn).................................................................................................................370
18.2.3 Master General Purpose Control Register (AXBS_MGPCRn)...................................................................372
18.3 Functional Description..................................................................................................................................................372
18.3.1 General operation.........................................................................................................................................372
18.3.2 Register coherency.......................................................................................................................................374
18.3.3 Arbitration....................................................................................................................................................374
18.4 Initialization/application information...........................................................................................................................377
Chapter 19
Memory Protection Unit (MPU)
19.1 Introduction...................................................................................................................................................................379
19.2 Overview.......................................................................................................................................................................379
19.2.1 Block diagram..............................................................................................................................................379
19.2.2 Features........................................................................................................................................................380
19.3 Memory map/register definition...................................................................................................................................381
19.3.1 Control/Error Status Register (MPU_CESR)..............................................................................................385
19.3.2 Error Address Register, slave port n (MPU_EARn)....................................................................................386
19.3.3 Error Detail Register, slave port n (MPU_EDRn).......................................................................................387
19.3.4 Region Descriptor n, Word 0 (MPU_RGDn_WORD0)..............................................................................388
19.3.5 Region Descriptor n, Word 1 (MPU_RGDn_WORD1)..............................................................................388
19.3.6 Region Descriptor n, Word 2 (MPU_RGDn_WORD2)..............................................................................389
19.3.7 Region Descriptor n, Word 3 (MPU_RGDn_WORD3)..............................................................................392
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19.3.8 Region Descriptor Alternate Access Control n (MPU_RGDAACn)...........................................................393
19.4 Functional description...................................................................................................................................................395
19.4.1 Access evaluation macro..............................................................................................................................395
19.4.2 Putting it all together and error terminations...............................................................................................396
19.4.3 Power management......................................................................................................................................397
19.5 Initialization information..............................................................................................................................................397
19.6 Application information................................................................................................................................................397
Chapter 20
Peripheral Bridge (AIPS-Lite)
20.1 Introduction...................................................................................................................................................................401
20.1.1 Features........................................................................................................................................................401
20.1.2 General operation.........................................................................................................................................402
20.2 Memory map/register definition...................................................................................................................................402
20.2.1 Master Privilege Register A (AIPSx_MPRA).............................................................................................404
20.2.2 Peripheral Access Control Register (AIPSx_PACRn).................................................................................407
20.2.3 Peripheral Access Control Register (AIPSx_PACRn).................................................................................412
20.3 Functional description...................................................................................................................................................417
20.3.1 Access support.............................................................................................................................................417
Chapter 21
Direct Memory Access Multiplexer (DMAMUX)
21.1 Introduction...................................................................................................................................................................419
21.1.1 Overview......................................................................................................................................................419
21.1.2 Features........................................................................................................................................................420
21.1.3 Modes of operation......................................................................................................................................420
21.2 External signal description............................................................................................................................................421
21.3 Memory map/register definition...................................................................................................................................421
21.3.1 Channel Configuration register (DMAMUX_CHCFGn)............................................................................422
21.4 Functional description...................................................................................................................................................423
21.4.1 DMA channels with periodic triggering capability......................................................................................423
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21.4.2 DMA channels with no triggering capability...............................................................................................425
21.4.3 "Always enabled" DMA sources.................................................................................................................425
21.5 Initialization/application information...........................................................................................................................426
21.5.1 Reset.............................................................................................................................................................427
21.5.2 Enabling and configuring sources................................................................................................................427
Chapter 22
Direct Memory Access Controller (eDMA)
22.1 Introduction...................................................................................................................................................................431
22.1.1 Block diagram..............................................................................................................................................431
22.1.2 Block parts...................................................................................................................................................432
22.1.3 Features........................................................................................................................................................433
22.2 Modes of operation.......................................................................................................................................................435
22.3 Memory map/register definition...................................................................................................................................435
22.3.1 Control Register (DMA_CR).......................................................................................................................446
22.3.2 Error Status Register (DMA_ES)................................................................................................................448
22.3.3 Enable Request Register (DMA_ ERQ ).....................................................................................................450
22.3.4 Enable Error Interrupt Register (DMA_ EEI ).............................................................................................452
22.3.5 Clear Enable Error Interrupt Register (DMA_CEEI)..................................................................................455
22.3.6 Set Enable Error Interrupt Register (DMA_SEEI)......................................................................................456
22.3.7 Clear Enable Request Register (DMA_CERQ)...........................................................................................457
22.3.8 Set Enable Request Register (DMA_SERQ)...............................................................................................458
22.3.9 Clear DONE Status Bit Register (DMA_CDNE)........................................................................................459
22.3.10 Set START Bit Register (DMA_SSRT)......................................................................................................460
22.3.11 Clear Error Register (DMA_CERR)............................................................................................................461
22.3.12 Clear Interrupt Request Register (DMA_CINT).........................................................................................462
22.3.13 Interrupt Request Register (DMA_ INT )....................................................................................................463
22.3.14 Error Register (DMA_ ERR )......................................................................................................................465
22.3.15 Hardware Request Status Register (DMA_ HRS )......................................................................................468
22.3.16 Channel n Priority Register (DMA_DCHPRIn)..........................................................................................470
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22.3.17 TCD Source Address (DMA_TCDn_SADDR)...........................................................................................471
22.3.18 TCD Signed Source Address Offset (DMA_TCDn_SOFF)........................................................................471
22.3.19 TCD Transfer Attributes (DMA_TCDn_ATTR).........................................................................................472
22.3.20 TCD Minor Byte Count (Minor Loop Disabled) (DMA_TCDn_NBYTES_MLNO).................................473
22.3.21 TCD Signed Minor Loop Offset (Minor Loop Enabled and Offset Disabled)
(DMA_TCDn_NBYTES_MLOFFNO).......................................................................................................473
22.3.22 TCD Signed Minor Loop Offset (Minor Loop and Offset Enabled)
(DMA_TCDn_NBYTES_MLOFFYES).....................................................................................................474
22.3.23 TCD Last Source Address Adjustment (DMA_TCDn_SLAST).................................................................476
22.3.24 TCD Destination Address (DMA_TCDn_DADDR)...................................................................................476
22.3.25 TCD Signed Destination Address Offset (DMA_TCDn_DOFF)................................................................477
22.3.26 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_CITER_ELINKYES)...........................................................................................................477
22.3.27 TCD Current Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_CITER_ELINKNO)............................................................................................................478
22.3.28 TCD Last Destination Address Adjustment/Scatter Gather Address (DMA_TCDn_DLASTSGA)..........479
22.3.29 TCD Control and Status (DMA_TCDn_CSR)............................................................................................480
22.3.30 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Enabled)
(DMA_TCDn_BITER_ELINKYES)...........................................................................................................482
22.3.31 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_BITER_ELINKNO)............................................................................................................483
22.4 Functional description...................................................................................................................................................484
22.4.1 eDMA basic data flow.................................................................................................................................484
22.4.2 Error reporting and handling........................................................................................................................487
22.4.3 Channel preemption.....................................................................................................................................489
22.4.4 Performance.................................................................................................................................................489
22.5 Initialization/application information...........................................................................................................................494
22.5.1 eDMA initialization.....................................................................................................................................494
22.5.2 Programming errors.....................................................................................................................................496
K20 Sub-Family Reference Manual, Rev. 2 Jun 2012
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Preliminary
Freescale Semiconductor, Inc.
General Business Information
Section number Title Page
22.5.3 Arbitration mode considerations..................................................................................................................496
22.5.4 Performing DMA transfers (examples)........................................................................................................497
22.5.5 Monitoring transfer descriptor status...........................................................................................................501
22.5.6 Channel Linking...........................................................................................................................................502
22.5.7 Dynamic programming................................................................................................................................504
Chapter 23
External Watchdog Monitor (EWM)
23.1 Introduction...................................................................................................................................................................509
23.1.1 Features........................................................................................................................................................509
23.1.2 Modes of Operation.....................................................................................................................................510
23.1.3 Block Diagram.............................................................................................................................................511
23.2 EWM Signal Descriptions............................................................................................................................................512
23.3 Memory Map/Register Definition.................................................................................................................................512
23.3.1 Control Register (EWM_CTRL).................................................................................................................512
23.3.2 Service Register (EWM_SERV)..................................................................................................................513
23.3.3 Compare Low Register (EWM_CMPL)......................................................................................................513
23.3.4 Compare High Register (EWM_CMPH).....................................................................................................514
23.3.5 Clock Prescaler Register (EWM_CLKPRESCALER)................................................................................515
23.4 Functional Description..................................................................................................................................................515
23.4.1 The EWM_out Signal..................................................................................................................................515
23.4.2 The EWM_in Signal....................................................................................................................................516
23.4.3 EWM Counter..............................................................................................................................................517
23.4.4 EWM Compare Registers............................................................................................................................517
23.4.5 EWM Refresh Mechanism...........................................................................................................................517
23.4.6 EWM Interrupt.............................................................................................................................................518
23.4.7 Counter clock prescaler................................................................................................................................518
Chapter 24
Watchdog Timer (WDOG)
24.1 Introduction...................................................................................................................................................................519
K20 Sub-Family Reference Manual, Rev. 2 Jun 2012
Freescale Semiconductor, Inc.
Preliminary
19
General Business Information
Section number Title Page
24.2 Features.........................................................................................................................................................................519
24.3 Functional overview......................................................................................................................................................521
24.3.1 Unlocking and updating the watchdog.........................................................................................................522
24.3.2 Watchdog configuration time (WCT)..........................................................................................................523
24.3.3 Refreshing the watchdog..............................................................................................................................524
24.3.4 Windowed mode of operation......................................................................................................................524
24.3.5 Watchdog disabled mode of operation.........................................................................................................524
24.3.6 Low-power modes of operation...................................................................................................................525
24.3.7 Debug modes of operation...........................................................................................................................525
24.4 Testing the watchdog....................................................................................................................................................526
24.4.1 Quick test.....................................................................................................................................................526
24.4.2 Byte test........................................................................................................................................................527
24.5 Backup reset generator..................................................................................................................................................528
24.6 Generated resets and interrupts.....................................................................................................................................528
24.7 Memory map and register definition.............................................................................................................................529
24.7.1 Watchdog Status and Control Register High (WDOG_STCTRLH)...........................................................530
24.7.2 Watchdog Status and Control Register Low (WDOG_STCTRLL)............................................................531
24.7.3 Watchdog Time-out Value Register High (WDOG_TOVALH).................................................................532
24.7.4 Watchdog Time-out Value Register Low (WDOG_TOVALL)..................................................................532
24.7.5 Watchdog Window Register High (WDOG_WINH)..................................................................................533
24.7.6 Watchdog Window Register Low (WDOG_WINL)...................................................................................533
24.7.7 Watchdog Refresh register (WDOG_REFRESH).......................................................................................534
24.7.8 Watchdog Unlock register (WDOG_UNLOCK).........................................................................................534
24.7.9 Watchdog Timer Output Register High (WDOG_TMROUTH).................................................................534
24.7.10 Watchdog Timer Output Register Low (WDOG_TMROUTL)..................................................................535
24.7.11 Watchdog Reset Count register (WDOG_RSTCNT)..................................................................................535
24.7.12 Watchdog Prescaler register (WDOG_PRESC)..........................................................................................536
24.8 Watchdog operation with 8-bit access..........................................................................................................................536
24.8.1 General guideline.........................................................................................................................................536
K20 Sub-Family Reference Manual, Rev. 2 Jun 2012
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Preliminary
Freescale Semiconductor, Inc.
General Business Information
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NXP K20_100 Reference guide

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Reference guide

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