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Clock Functions
Technical Data MC68HC912D60A — Rev. 3.1
146 Clock Functions Freescale Semiconductor
Therefore, if the MCU is powered up without an external clock, limp-
home mode is entered provided the MCU is in a normal mode of
operation.
Figure 11-4. No Clock at Power-On Reset
VDD
Power-On Detector
Clock Monitor Fail
EXTALi
13-stage counter
Internal reset
0 --> 4096
Limp-Home
(Clocked by XCLK)
BCSP
Reset: BCSP = 0
SYSCLK PLLCLK (L.H.) EXTALi
SYSCLK PLLCLK (Software check of Limp-Home Flag) EXTALi
(Slow EXTALi)
0 --> 4096
(Slow EXTALi)
- MC68Hc912D60A 1
- MC68HC912D60C 1
- MC68HC912D60P 1
- MC68HC912D60A 3
- 4 Freescale Semiconductor 4
- List of Paragraphs 5
- Table of Contents 10
- Section 11. Clock Functions 10
- Section 12. Oscillator 10
- Section 17. MSCAN Controller 12
- List of Figures 15
- List of Tables 19
- 1.1 Contents 23
- 1.2 Introduction 23
- General Description 24
- are devices similar to 24
- 1.4 Features 24
- Features 25
- 1.5 Ordering Information 27
- 1.6 Block Diagrams 29
- 2.1 Contents 31
- 2.2 Introduction 31
- 2.3 Programming Model 31
- Central Processing Unit 32
- 2.4 Data Types 33
- 2.5 Addressing Modes 33
- 2.6 Indexed Addressing Modes 35
- 2.7 Opcodes and Operands 36
- 3.1 Contents 37
- 3.4 Power Supply Pins 42
- 3.5 Signal Descriptions 44
- Signal Descriptions 45
- 3.6 Port Signals 52
- Port Signals 53
- Section 4. Registers 61
- Registers 62
- 5.1 Contents 71
- 5.2 Introduction 71
- 5.3 Operating Modes 71
- Operating Modes 73
- 5.4 Background Debug Mode 74
- MODE — Mode Register $000B 75
- Internal Resource Mapping 77
- RESET:00000001 80
- 5.6 Memory Maps 83
- . MC68HC912D60A Memory Map 83
- 6.1 Contents 85
- 6.2 Introduction 85
- Bus Control and Input/Output 86
- 6.4 Registers 86
- Section 7. Flash Memory 97
- 7.3 Overview 98
- 7.5 Flash EEPROM Arrays 98
- 7.6 Flash EEPROM Registers 99
- Flash Memory 100
- 7.7 Operation 100
- Programming the Flash EEPROM 101
- 7.9 Erasing the Flash EEPROM 103
- 7.10 Stop or Wait Mode 103
- Section 8. EEPROM Memory 105
- EEPROM Memory 106
- EEPROM Programmer’s Model 107
- EXTALi (hz) x 35 109
- EEPROM Control Registers 111
- Bit 7654321Bit 0 113
- RESET: 10000000 113
- 8.6 Program/Erase Operation 115
- 8.7 Shadow Word Mapping 115
- 9.1 Contents 119
- 9.2 Introduction 119
- Resets and Interrupts 120
- 9.3 Maskable interrupts 120
- 9.4 Latching of Interrupts 121
- 9.6 Resets 124
- 9.7 Effects of Reset 126
- 9.8 Register Stacking 127
- 9.9 Customer Information 128
- 10.1 Contents 129
- 10.2 Introduction 129
- I/O Ports with Key Wake-up 130
- Clock Functions 138
- 11.3 Clock Sources 138
- 11.4 Phase-Locked Loop (PLL) 139
- PLLFLG — PLL Flags $003B 157
- 11.8 Clock Divider Chains 162
- 11.10 Real-Time Interrupt 167
- 11.11 Clock Monitor 167
- RTIF0000000 169
- RESET: 00000000 169
- Oscillator 176
- EXTAL-XTAL 189
- Oscillator Design Guidelines 193
- EXTAL-VSS 205
- Guidelines 206
- 13.1 Contents 207
- 13.2 Introduction 207
- Pulse Width Modulator 208
- Introduction 209
- PWM Register Description 211
- PWCNTx — PWM Channel Counters 217
- 13.4 PWM Boundary Cases 222
- 14.1 Contents 223
- 14.2 Introduction 223
- Enhanced Capture Timer 224
- 14.4 Timer Registers 233
- BIT 7654321BIT 0 245
- 000000PAOVFPAIF 245
- RESET: 0 0 0 0 0 0 0 0 249
- Timer Registers 253
- 15.1 Contents 263
- 15.2 Introduction 263
- Multiple Serial Interface 264
- 15.3 Block diagram 264
- 15.6 Port S 285
- 16.1 Contents 289
- 16.2 Introduction 289
- Freescale Interconnect Bus 290
- 16.3 Push-pull sequence 290
- 16.4 Biphase coding 291
- 16.5 Message validation 292
- STOP START 293
- 16.6 Interfacing to MI Bus 294
- Interfacing to MI Bus 295
- 16.7 MI Bus clock rate 296
- 16.8 SCI0/MI Bus registers 296
- SCI0/MI Bus registers 297
- MSCAN Controller 304
- 17.3 External Pins 304
- 17.4 Message Storage 305
- Message Storage 307
- Identifier Acceptance Filter 311
- 17.6 Interrupts 314
- 17.8 Low Power Modes 316
- 1. X means don’t care 317
- Low Power Modes 319
- 17.9 Timer Link 320
- 17.10 Clock System 321
- 17.11 Memory Map 324
- RESET 00000000 333
- RESET 0 0 000000 335
- 18.1 Contents 349
- 18.2 Introduction 349
- Analog-to-Digital Converter 350
- HC12 ATD BLOCK 350
- Modes of Operation 351
- 18.4 Functional Description 352
- Functional Description 353
- 18.5 ATD Operational Modes 354
- 18.9 ATD Registers 358
- ATD Registers 363
- 19.1 Contents 377
- 19.2 Introduction 377
- 19.3 Instruction Queue 377
- Development Support 378
- 19.4 Background Debug Mode 379
- Background Debug Mode 381
- 19.5 Breakpoints 395
- Breakpoints 397
- 19.6 Instruction Tagging 402
- 20.1 Contents 405
- 20.2 Introduction 405
- Electrical Specifications 406
- 20.3 Tables of Data 406
- Table 20-4. Supply Current 409
- Table 20-12. Control Timing 413
- Tables of Data 415
- Table 20-15. SPI Timing 422
- Table 20-18. Key Wake-up 426
- 22.1 Contents 437
- Mask Set Changes 443
- 23.4 Clock Circuitry 444
- 23.5 Pseudo Stop Mode 444
- 23.6 Oscillator 444
- 23.7 PLL 445
- Glossary 447
- Revision History 457
- How to Reach Us: 460
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