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MC908QC8CDRE Datasheet(PDF) 85 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QC8CDRE
Descripción  M68HC08 Microcontrollers
Descarga  274 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC908QC8CDRE Datasheet(HTML) 85 Page - Freescale Semiconductor, Inc

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MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 5
Freescale Semiconductor
85
Chapter 8
Keyboard Interrupt Module (KBI)
8.1 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. See Figure 8-2 for port location of these
shared pins.
8.2 Features
Features of the keyboard interrupt module include:
Keyboard interrupt pins with separate keyboard interrupt enable bits and one keyboard interrupt
mask
Programmable edge-only or edge and level interrupt sensitivity
Edge sensitivity programmable for rising or falling edge
Level sensitivity programmable for high or low level
Pullup or pulldown device automatically enabled based on the polarity of edge or level detect
Exit from low-power modes
8.3 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.
Figure 8-1. Keyboard Interrupt Block Diagram
KBI LATCH
KEYBOARD
INTERRUPT
REQUEST
ACKK
INTERNAL BUS
RESET
KBIE0
KBI0
0
1
S
KBIP0
KBIEx
KBIx
0
1
S
KBIPx
DQ
CK
CLR
VDD
MODEK
IMASKK
SYNCHRONIZER
KEYF
TO PULLUP/
TO PULLUP/
PULLDOWN ENABLE
PULLDOWN ENABLE
VECTOR FETCH
DECODER


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