MC908GR8CDWE Datasheet, PDF (177/408 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Freescale Semiconductor, Inc.
Keyboard Interrupt (KBI)
Functional Description
INTERNAL BUS
KBD0
TO PULLUP
.
ENABLE
.
KB0IE
.
KBD3
VDD
CLR
D
Q
CK
ACKK
RESET
VECTOR FETCH
DECODER
KEYF
SYNCHRONIZER
KEYBOARD
INTERRUPT FF
IMASKK
KEYBOARD
INTERRUPT
REQUEST
TO PULLUP
ENABLE
KB3IE
MODEK
Figure 13-1. Keyboard Module Block Diagram
Addr. Register Name
Bit 7
6
5
4
3
Read: 0
0
0
0
KEYF
Keyboard Status
$001A
and Control Register Write:
(INTKBSCR)
Reset: 0
0
0
0
0
Read:
$001B
Keyboard Interrupt Enable
Register (INTKBIER)
Write:
Reset:
KBIE3
0
= Unimplemented
Figure 13-2. I/O Register Summary
2
0
ACKK
0
1
Bit 0
IMASKK MODEK
0
0
KBIE2 KBIE1 KBIE0
0
0
0
MC68HC908GR8 — Rev 4.0
MOTOROLA
Keyboard Interrupt (KBI)
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Technical Data
177