MC68HC908AZ60 Datasheet, PDF (385/480 Pages) Motorola, Inc – HCMOS Microcontroller Unit

INTERNAL BUS
KBD0
TO PULLUP ENABLE
.
.
KB0IE
.
KBD4
V_DD
D ^CLR Q
CK
ACKK
RESET
VECTOR FETCH
DECODER
KEYF
SYNCHRONIZER
KEYBOARD
INTERRUPT FF
IMASKK
KEYBOARD
INTERRUPT
REQUEST
TO PULLUP ENABLE
KB4IE
MODEK
Figure 1. Keyboard Module Block Diagram
Register Name
Bit 7
6
Read: 0
0
Keyboard Status and Control
Register (KBSCR)
Write:
Reset: 0
0
Read: 0
0
Keyboard Interrupt Enable
Register (KBIER)
Write:
Reset: 0
0
5
4
3
2
1
Bit 0
0
0
KEYF
0
ACKK
IMASKK MODEK
0
0
0
0
0
0
0
KBIE4 KBIE3 KBIE2 KBIE1 KBIE0
0
0
0
0
0
0
= Unimplemented
Figure 2. I/O Register Summary
Table 1. I/O Register Address Summary
Register
Address
KBSCR
$001A
KBIER
$001B