MC908AZ32ACFUE Datasheet, PDF (237/324 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 22
Keyboard Module (KBD)
22.1 Introduction
The keyboard interrupt module (KBD) provides five independently maskable external interrupt pins.
This module is only available on 64-pin package options.
22.2 Features
KBD features include:
• Five 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
• Automatic Interrupt Acknowledge
• Exit from Low-Power Modes
INTERNAL BUS
KBD0
TO
PULLUP
ENABLE
KBD4
TO
PULLUP
ENABLE
.
.
KB0IE
.
KB4IE
V_DD
D ^CLR Q
CK
ACKK
RESET
VECTOR FETCH
DECODER
SYNCHRONIZER
KEYF
KEYBOARD
INTERRUPT FF
IMASKK
MODEK
KEYBOARD
INTERRUPT
REQUEST
Figure 22-1. Keyboard Module Block Diagram
MC68HC908AZ32A Data Sheet, Rev. 2
Freescale Semiconductor
237