MC68HC908JB8 Datasheet, PDF (229/286 Pages) Motorola, Inc – MICROCONTROLLERS

Keyboard Interrupt Module (KBI)
Pin Name Conventions
INTERNAL BUS
KBA0
.
KBIE0
.
TO PULLUP ENABLE
.
KBA7
KBIE7
TO PULLUP ENABLE
V_REG
D ^CLR Q
CK
ACKK
RESET
KEYBOARD
INTERRUPT FF
VECTOR FETCH
DECODER
KEYF
SYNCHRONIZER
Keyboard
Interrupt
Request
IMASKK
MODEK
Figure 14-1. Keyboard Module Block Diagram
Table 14-2. I/O Register Summary
Addr.
Register Name
Bit 7
6
5
$0016 Keyboard Status and Control Read: 0
0
0
Register
(KBSCR) ^Write:
Reset: 0
0
0
$0017
Keyboard Interrupt Enable Read:
Register
(KBIER) ^Write:
Reset:
KBIE7
0
KBIE6
0
KBIE5
0
= Unimplemented
4
0
0
KBIE4
0
3
KEYF
0
KBIE3
0
2
0
ACKK
0
1
Bit 0
IMASKK MODEK
0
0
KBIE2 KBIE1 KBIE0
0
0
0
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
Keyboard Interrupt Module (KBI)
Technical Data
229