The Definitive Guide to the ARM Cortex-M3

CHAPTER 7 Exceptions

In This Chapter:

• Exception Types

• Definitions of Priority

• Vector Tables

• Interrupt Inputs and Pending Behavior

• Fault Exceptions

• SVC and PendSV

Exception Types

The Cortex-M3 provides a feature-packed exception architecture that supports a number of system exceptions and external interrupts. Exceptions are numbered 1 to 15 for system exceptions and 16 and above for external interrupt inputs. Most of the exceptions have programmable priority, and a few have fixed priority.

Cortex-M3 chips can have different numbers of external interrupt inputs (from 1 to 240) and different numbers of priority levels. This is because chip designers can configure the Cortex-M3 design source code for different needs.

Exception types ...