The Definitive Guide to the ARM Cortex-M3

CHAPTER 15 Debug Architecture

In This Chapter:

• Debugging Features Overview

• CoreSight Overview

• Debug Modes

• Debugging Events

• Breakpoint in the Cortex-M3

• Accessing Register Content in Debug

• Other Core Debugging Features

Debugging Features Overview

The Cortex-M3 processor provides a comprehensive debugging environment. Based on the nature of operations, the debugging features can be classified into two groups:

1. Invasive debugging:
   • Program halt and stepping
   • Hardware breakpoints
   • Breakpoint instruction
   • Data watchpoint on access to data address, address range, or data value
   • Register value accesses (both read or write)
   • Debug monitor exception
   • ROM-based debugging (Flash patch)
2. Noninvasive debugging:
   • Memory accesses (memory contents ...