MC68HC08AZ16 Datasheet, PDF (316/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

PTG4/KBD
To pullup enable
KB4IE
PTG0/KBD
To pullup enable
KB0IE
INTERNAL BUS
V_DD
D ^CLR Q
CK
ACKK
KEYBOARD
INTERRUPT LATCH
MODEK
VECTOR FETCH
DECODER
SYNCHRONIZER
IMASKK
KEYBOARD
INTERRUPT
REQUEST
Figure 5. Keyboard module block diagram
Table 1. KB I/O register summary
Register Name
Bit 7 6
5
4
3
2
1 Bit 0 Addr.
Keyboard Status/Control ^{R: 0}
Register (KBSCR) _W:
0
0
0
KEYF
0
ACKK
IMASK MODE
K
K
$001B
Reset
0
0
0
0
0
0
0
0
Keyboard Interrupt Control ^{R: 0}
Register (KBICR) _W:
0
0
KB4IE KB3IE KB2IE KB1IE KB0IE $0021
Reset
0
0
0
0
0
0
0
0
= Unimplemented