Datasheet

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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