MC68HC908LD64 Datasheet, PDF (321/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Data Sheet — MC68HC908LD64
Section 21. Keyboard Interrupt Module (KBI)
21.1 Contents
21.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
21.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
21.4 I/O Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
21.5 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .323
21.6 Keyboard Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
21.7 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
21.7.1 Keyboard Status and Control Register. . . . . . . . . . . . . . . . 326
21.7.2 Keyboard Interrupt Enable Register . . . . . . . . . . . . . . . . . . 327
21.8 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327
21.8.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .327
21.8.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .327
21.9 Keyboard Module During Break Interrupts . . . . . . . . . . . . . . . 328
21.2 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
pull-up device is also enabled on the pin.
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor
Keyboard Interrupt Module (KBI)
Data Sheet
321