The Definitive Guide to the ARM Cortex-M3

CHAPTER 8 The NVIC and Interrupt Control

In This Chapter:

• NVIC Overview

• The Basic Interrupt Configuration

• Interrupt Enable and Clear Enable

• Interrupt Pending and Clear Pending

• Example Procedures in Setting Up an Interrupt

• Software Interrupts

• The SYSTICK Timer

NVIC Overview

As we’ve seen, the Nested Vectored Interrupt Controller, or NVIC, is an integrated part of the Cortex-M3 processor. It is closely linked to the Cortex-M3 CPU core logic. Its control registers are accessible as memory-mapped devices. Besides control registers and control logic for interrupt processing, the NVIC also contains control registers for the MPU, the SYSTICK Timer, and debugging controls. In this chapter we’ll examine the control logic for interrupt ...