MC68HC908AT32 Datasheet, PDF (282/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

INTERNAL BUS
KBD0
TO PULLUP ENABLE
KBD7
TO PULLUP ENABLE
.
.
KB0IE
.
V_DD
CLR
D
Q
CK
ACKK
RESET
VECTOR FETCH
DECODER
KEYF
SYNCHRONIZER
KEYBOARD
INTERRUPT FF
IMASKK
MODEK
KB7IE
Figure 24-1. Keyboard Module Block Diagram
KEYBOARD
INTERRUPT
REQUEST
Address
$001A
$001B
Register Name
Bit 7
Read: 0
Keyboard Status and Control Register
(KBSCR) Write:
See page 285.
Reset: 0
Read: 0
Keyboard Interrupt Enable Register
(KBIER) Write:
See page 285.
Reset: 0
6
5
0
0
0
0
0
0
0
0
= Unimplemented
4
3
0
KEYF
0
0
KBIE4 KBIE3
0
0
Figure 24-2. I/O Register Summary
2
0
ACKK
0
1
Bit 0
IMASKK MODEK
0
0
KBIE2 KBIE1 KBIE0
0
0
0