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System Control
ARM DDI 0337I Copyright © 2005-2008, 2010 ARM Limited. All rights reserved. 4-5
ID072410 Non-Confidential
4.3 Register descriptions
This section describes the system control registers whose implementation is specific to this
processor.
4.3.1 Auxiliary Control Register, ACTLR
The ACTLR characteristics are:
Purpose Disables certain aspects of functionality within the processor.
Usage Constraints There are no usage constraints.
Configurations This register is available in all processor configurations.
Attributes See the register summary in Table 4-1 on page 4-3.
Figure 4-1 shows the ACTLR bit assignments.
Figure 4-1 ACTLR bit assignments
Table 4-2 shows the ACTLR bit assignments.
4.3.2 CPUID Base Register, CPUID
The CPUID characteristics are:
Purpose Specifies:
• the ID number of the processor core
• the version number of the processor core
• the implementation details of the processor core.
Usage Constraints There are no usage constraints.
Configurations This register is available in all processor configurations.
Attributes See the register summary in Table 4-1 on page 4-3.
Reserved
31 3210
DISFOLD
DISDEFWBUF
DISMCYCINT
Table 4-2 ACTLR bit assignments
Bits Name Function
[31:3] - Reserved
[2] DISFOLD Disables folding of
IT
instructions.
[1] DISDEFWBUF Disables write buffer use during default memory map accesses. This causes all bus faults to be precise,
but decreases the performance of the processor because stores to memory must complete before the
next instruction can be executed.
[0] DISMCYCINT Disables interruption of multi-cycle instructions. This increases the interrupt latency of the processor
because load/store and multiply/divide operations complete before interrupt stacking occurs.
- Technical Reference Manual 1
- Cortex-M3 2
- Contents 3
- List of Tables 5
- List of Figures 7
- • About this book on page x 9
- • Feedback on page xiii 9
- About this book 10
- Preface 11
- Other publications 12
- Feedback 13
- Chapter 1 14
- Introduction 14
- 1.1 About the processor 15
- 1.2 Features 16
- 1.3 Interfaces 17
- 1.4 Configurable options 18
- 1.5 Product documentation 19
- 1.6 Product revisions 22
- 0xE000ED14 23
- Chapter 2 25
- Functional Description 25
- 2.1 About the functions 26
- 2.2 Interfaces 28
- Chapter 3 31
- Programmers Model 31
- 3.3 Instruction set summary 34
- — STKALIGN bit to 1 40
- — UNALIGN_TRP bit to 1 40
- 3.4 System address map 41
- LDRH, STR, STRH 42
- 3.5 Write buffer 44
- 3.6 Exclusive monitor 45
- 3.7 Bit-banding 46
- Figure 3-2 Bit-band mapping 47
- 3.9 Exceptions 50
- Chapter 4 52
- System Control 52
- 4.1 About system control 53
- 4.2 Register summary 54
- 4.3 Register descriptions 56
- Chapter 5 58
- Memory Protection Unit 58
- 5.1 About the MPU 59
- 5.3 MPU programmers model 61
- Chapter 6 62
- 6.1 About the NVIC 63
- 6.3 NVIC programmers model 65
- Chapter 7 67
- 7.1 About debug 68
- 0xE000ED00 69
- 0xE00FF000 70
- 7.2 About the AHB-AP 72
- 7.3.2 FPB programmers model 76
- Chapter 8 77
- 8.1 About the DWT 78
- 8.3 DWT Programmers Model 80
- 0x40000000 81
- 0x4F000000 81
- 0x10000000 81
- 0x1F000000 81
- Chapter 9 82
- 9.1 About the ITM 83
- 9.3 ITM programmers model 85
- PRIVMASK 86
- Chapter 10 87
- 10.1 About the ETM 88
- Figure 10-1 ETM block diagram 89
- 10.2.9 Operation 94
- 10.3 ETM Programmers model 95
- Embedded Trace Macrocell 100
- ID072410 Non-Confidential 100
- Reserved 102
- 26 25 24 102
- Trace control enable 102
- Reserved, RAZ 106
- ETM powered up 106
- TRIGGER output value 107
- Chapter 11 109
- Trace Port Interface Unit 109
- 11.1 About the Cortex-M3 TPIU 110
- 11.3 TPIU programmers model 113
- TRIGGER input value 116
- Appendix A 122
- Revisions 122
- Glossary 129
- 0x00000000 132
- 0x1FFFFFFFF 132
- 0xE0040000 133
- 0xE00FFFFF 133
- 0x1FFFFFFF 133
- 0xE0000000 134
- 0xE003FFFF 134
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