MC68HC908JL3E Datasheet, PDF (171/226 Pages) Motorola, Inc – Microcontrollers

Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 14. Keyboard Interrupt Module (KBI)
14.1 Contents
14.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
14.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
14.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
14.4.1 Keyboard Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
14.4.2 Keyboard Status and Control Register. . . . . . . . . . . . . . . . 175
14.4.3 Keyboard Interrupt Enable Register . . . . . . . . . . . . . . . . . . 176
14.5 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
14.5.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
14.5.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
14.6 Keyboard Module During Break Interrupts . . . . . . . . . . . . . . .177
14.2 Introduction
The keyboard interrupt module (KBI) provides seven independently
maskable external interrupts which are accessible via PTA0–PTA6 pins.
14.3 Features
Features of the keyboard interrupt module include the following:
• Seven keyboard interrupt pins with separate keyboard interrupt
enable bits and one keyboard interrupt mask
• Software configurable pull-up device if input pin is configured as
input port bit
• Programmable edge-only or edge- and level- interrupt sensitivity
• Exit from low-power modes
MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0
MOTOROLA
Keyboard Interrupt Module (KBI)
Technical Data
171