MC68HC908RF2 Datasheet, PDF (185/254 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Keyboard/External Interrupt Module (KBI)
Functional Description
ACKI
RESET
VECTOR
FETCH
DECODER
V_DD
INTERNAL
PULLUP
DEVICE
IRQ1
V_DD
CLR
D
Q
CK
IRQ1
LATCH
SYNCHRO-
NIZER
IMASKI
MODEI
HIGH
VOLTAGE
DETECT
Figure 14-1. IRQ Block Diagram
TO CPU FOR
BIL/BIH
INSTRUCTIONS
IRQ1F
IRQ1
INTERRUPT
REQUEST
KEYBOARD
INTERRUPT
REQUEST
IRQ1/KEYBOARD
INTERRUPT
REQUEST
TO MODE
SELECT
LOGIC
Addr. Register Name
Bit 7
$001A
IRQ and Keyboard Status ^Read:
and Control Register
(INTKBSCR)
Write:
See page 193. _Reset:
IRQ1F
R
0
Read: 0
Keyboard Interrupt Enable
$001B
Register (INTKBIER) Write:
See page 195.
Reset: 0
6
5
0
IMASKI
ACKI
0
0
KBIE6 KBIE5
0
0
= Unimplemented
4
MODEI
0
3
KEYF
R
0
2
0
ACKK
0
KBIE4 KBIE3 KBIE2
0
0
0
R = Reserved
1
Bit 0
IMASKK MODEK
0
0
0
KBIE1
0
0
Figure 14-2. IRQ and Keyboard I/O Register Summary
MC68HC908RF2
MOTOROLA
Keyboard/External Interrupt Module (KBI)
Advance Information
185