Datasheet

Keyboard Interrupt Module (KBI)
Pin Name Conventions
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3 Technical Data
Freescale Semiconductor Keyboard Interrupt Module (KBI) 229
Figure 14-1. Keyboard Module Block Diagram
KBIE0
KBIE7
.
.
.
DQ
CK
CLR
V
REG
MODEK
IMASKK
KEYBOARD
INTERRUPT FF
VECTOR FETCH
DECODER
ACKK
INTERNAL BUS
RESET
KBA7
KBA0
SYNCHRONIZER
KEYF
Keyboard
Interrupt
Request
TO PULLUP ENABLE
TO PULLUP ENABLE
Table 14-2. I/O Register Summary
Addr.Register Name Bit 7654321Bit 0
$0016 Keyboard Status and Control
Register
(KBSCR)
Read: 0 0 0 0 KEYF 0
IMASKK MODEK
Write:
ACKK
Reset:00000000
$0017 Keyboard Interrupt Enable
Register
(KBIER)
Read:
KBIE7 KBIE6 KBIE5 KBIE4 KBIE3 KBIE2 KBIE1 KBIE0
Write:
Reset:00000000
= Unimplemented