The Definitive Guide to the ARM Cortex-M3, 2nd Edition

APPENDIX E

Cortex-M3 Troubleshooting Guide

E.1 Overview

One of the challenges of using the Cortex™-M3 is to locate problems when the program goes wrong. The Cortex-M3 processor provides a number of Fault Status registers to assist in troubleshooting (see Table E.1).

Table E.1

Fault Status Registers on Cortex-M3

Address	Register	Full Name	Size
0xE000ED28	MMSR	MemManage Fault Status register	Byte
0xE000ED29	BFSR	Bus Fault Status register	Byte
0xE000ED2A	UFSR	Usage Fault Status register	Half word
0xE000ED2C	HFSR	Hard Fault Status register	Word
0xE000ED30	DFSR	Debug Fault Status register	Word
0xE000ED3C	AFSR	Auxiliary Fault Status register	Word

The MMSR, BFSR, and UFSR registers ...