M68HC05 datasheet(41/128 Pages) FREESCALE

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MC68HC05J1A — Rev. 3.0

Technical Data

Interrupts

Technical Data — MC68HC05J1A

Section 4. Interrupts

4.1 Contents

4.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

4.3

Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

4.3.1

Software Interrupt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.3.2

External Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

4.3.2.1

IRQ Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

4.3.2.2

PA3–PA0 Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

4.3.2.3

IRQ Status and Control Register . . . . . . . . . . . . . . . . . . . 45

4.3.3

Timer Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.3.3.1

Timer Overflow Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.3.3.2

Real-Time Interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4.4

Interrupt Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

4.2 Introduction

This section describes how interrupts temporarily change the normal

processing sequence.

4.3 Interrupt Sources

These sources can generate interrupt requests:

•

SWI (software interrupt) instruction

•

IRQ pin

•

PA3–PA0 pins (mask option)

•

Multifunction timer

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