M68ICS08GR datasheet(175/408 Pages) FREESCALE

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MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Keyboard Interrupt (KBI)

175

Technical Data — MC68HC908GR8

Section 13. Keyboard Interrupt (KBI)

13.1 Contents

13.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

13.3

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

13.4

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

13.5

Keyboard Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

13.6

Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180

13.7

Keyboard Module During Break Interrupts . . . . . . . . . . . . . . .180

13.8

I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

13.2 Introduction

The keyboard interrupt module (KBI) provides four independently

maskable external interrupts.

13.3 Features

•

Four keyboard interrupt pins with separate keyboard interrupt

enable bits and one keyboard interrupt mask

•

Hysteresis buffers

•

Programmable edge-only or edge- and level- interrupt sensitivity

•

Exit from low-power modes

•

I/O (input/output) port bit(s) software configurable with pullup

device(s) if configured as input port bit(s)

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