MC68HC908GT16 Datasheet, PDF (195/412 Pages) Motorola, Inc – Microcontrollers

Technical Data — MC68HC908GT16 • MC68HC908GT8
Section 13. Keyboard Interrupt Module (KBI)
13.1 Contents
13.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
13.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
13.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
13.5 Keyboard Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
13.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
13.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200
13.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200
13.7 Keyboard Module During Break Interrupts . . . . . . . . . . . . . . . 200
13.8 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
13.8.1 Keyboard Status and Control Register. . . . . . . . . . . . . . . . 201
13.8.2 Keyboard Interrupt Enable Register . . . . . . . . . . . . . . . . . . 202
13.2 Introduction
The keyboard interrupt module (KBI) provides eight independently
maskable external interrupts which are accessible via PTA0–PTA7.
When a port pin is enabled for keyboard interrupt function, an internal
pullup device is also enabled on the pin.
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
MOTOROLA
Keyboard Interrupt Module (KBI)
Technical Data
195