MC68HC908GP32_08 Datasheet, PDF (105/266 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Chapter 10
Keyboard Interrupt (KBI) Module
10.1 Introduction
The keyboard interrupt module (KBI) provides independently maskable external interrupts.
The KBI shares its pins with general-purpose input/output (I/O) port pins.
10.2 Features
Features of the keyboard interrupt module include:
• Keyboard interrupt pins with separate keyboard interrupt enable bits and one keyboard interrupt
mask
• Pullup device automatically enabled when pin is used for KBI input
• Programmable edge-only or edge and level interrupt sensitivity
• Exit from low-power modes
10.3 Functional Description
The keyboard interrupt module controls the enabling/disabling of interrupt functions on the KBI pins.
These pins can be enabled/disabled independently of each other.
INTERNAL BUS
VECTOR FETCH
DECODER
ACKK
RESET
KBI0
KBIE0
V_DD
CLR
D
Q
CK
KEYF
SYNCHRONIZER
KBIx
KBIEx
KBI LATCH
IMASKK
MODEK
Figure 10-1. Keyboard Interrupt Block Diagram
KEYBOARD
INTERRUPT
REQUEST
MC68HC908GP32 Data Sheet, Rev. 10
Freescale Semiconductor
105