mc68hc908kx8 Freescale Semiconductor, Inc, mc68hc908kx8 Datasheet - Page 95

• Manufacturer Part Number: mc68hc908kx8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 9
Keyboard Interrupt Module (KBI)
9.1 Introduction
The keyboard interrupt module (KBI) provides five independently maskable external interrupt pins.
9.2 Features
KBI features include:
Freescale Semiconductor
TO PULLUP
TO PULLUP
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•
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ENABLE
ENABLE
or KBD3
KBD0
KBD4
Five keyboard interrupt pins, on the MC68HC08KX8, 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
KB4IE or KB3IE
KB0IE
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
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Figure 9-1. Keyboard Module Block Diagram
MODEK
V
DD
D
CK
CLR
Q
INTERRUPT FF
KEYBOARD
RESET
ACKK
IMASKK
SYNCHRONIZER
VECTOR FETCH
INTERNAL BUS
DECODER
KEYF
KEYBOARD
INTERRUPT
REQUEST
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