MC68HC908KX8 Datasheet, PDF (172/310 Pages) Motorola, Inc – Microcontrollers

Keyboard Interrupt Module (KBI)
13.3 Features
KBI features include:
• Five keyboard interrupt pins, on the MC68HC908KX8, are 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


KB0IE

KBD4
or KBD3
TO PULLUP
ENABLE
KB4IE or KB3IE
V_''
D ^CLR Q
CK
ACKK
RESET
VECTOR FETCH
DECODER
KEYF
SYNCHRONIZER
MODEK
KEYBOARD
INTERRUPT FF
IMASKK
KEYBOARD
INTERRUPT
REQUEST
Figure 13-1. Keyboard Module Block Diagram
Technical Data
172
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
Keyboard Interrupt Module (KBI)
MOTOROLA