MC908AS60ACFU Datasheet, PDF (302/414 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

INTERNAL BUS
KBD0
TO PULLUP ENABLE
KBD4
.
.
KB0IE
.
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 24-1. 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
IMASKK MODEK
ACKK
0
0
0
0
0
0
0
KBIE4 KBIE3 KBIE2 KBIE1 KBIE0
0
0
0
0
0
0
= Unimplemented
Figure 24-2. I/O Register Summary
Table 24-1. I/O Register Address Summary
Register
Address
KBSCR
$001B
KBIER
$0021