MC68HC908JK3 MOTOROLA [Motorola, Inc], MC68HC908JK3 Datasheet - Page 166

• Manufacturer Part Number: MC68HC908JK3
• Description: MC68HC908JK1
• Manufacturer: MOTOROLA [Motorola, Inc]

Keyboard Interrupt Module (KBI)
14.4 Functional Description
Technical Data
166
KBI0
KBI6
Addr.
TO PULLUP ENABLE
TO PULLUP ENABLE
$001A
$001B
Keyboard Interrupt Enable
KBIE0
KBIE6
Register Name
and Control Register
Register (KBIER)
Keyboard Status
.
.
.
(KBSCR)
Figure 14-2. Keyboard Interrupt Block Diagram
Writing to the KBIE6–KBIE0 bits in the keyboard interrupt enable register
independently enables or disables each port A pin as a keyboard
interrupt pin. Enabling a keyboard interrupt pin in port A also enables its
internal pull-up device irrespective of PTAPUEx bits in the port A input
pull-up enable register (see 12.4.2). A logic 0 applied to an enabled
keyboard interrupt pin latches a keyboard interrupt request.
Reset:
Reset:
Read:
Write:
Read:
Write:
Figure 14-1. KBI I/O Register Summary
Bit 7
0
0
0
0
Keyboard Interrupt Module (KBI)
MODEK
V
= Unimplemented
DD
KBIE6
6
0
0
0
D
CK
CLR
Q
KBIE5
5
0
0
0
INTERRUPT FF
KEYBOARD
KBIE4
4
0
0
0
RESET
ACKK
KBIE3
KEYF
3
0
0
VECTOR FETCH
INTERNAL BUS
MC68H(R)C908JL3
DECODER
IMASKK
ACKK
KBIE2
SYNCHRONIZER
2
0
0
0
IMASKK
KBIE1
1
0
0
KEYF
MOTOROLA
—
Rev. 1.0
MODEK
KBIE0
Bit 0
Keyboard
Interrupt
Request
0
0