ARM Cortex-M3 User's Guide download pdf (Page 78)

Data Watchpoint and Trace Unit

ID072410 Non-Confidential

8.1 About the DWT

The DWT is an optional debug unit that provides watchpoints, data tracing, and system profiling

for the processor.

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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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ARM Cortex-M3 User's Guide Page 78

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