MC68HC908JB8 Datasheet, PDF (227/286 Pages) Motorola, Inc – MICROCONTROLLERS

Technical Data — MC68HC908JB8•MC68HC08JB8•MC68HC08JT8
Section 14. Keyboard Interrupt Module (KBI)
14.1 Contents
14.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
14.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
14.4 Pin Name Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
14.5 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .230
14.6 Keyboard Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
14.7 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
14.7.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232
14.7.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232
14.8 Keyboard Module During Break Interrupts . . . . . . . . . . . . . . . 233
14.9 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
14.9.1 Keyboard Status and Control Register. . . . . . . . . . . . . . . . 233
14.9.2 Keyboard Interrupt Enable Register . . . . . . . . . . . . . . . . . . 235
14.2 Introduction
The keyboard interrupt module (KBI) provides eight independently
maskable external interrupts which are accessible via PTA0–PTA7 pins.
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
Keyboard Interrupt Module (KBI)
Technical Data
227