MC68HC08AZ16 Datasheet, PDF (319/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Keyboard Module (KB)
I/O Registers
The following registers control and monitor operation of the keyboard
module:
• Keyboard status and control register (KBSCR)
• Keyboard interrupt enable register (KBIER)
Keyboard status
and control
register (KBSCR)
The keyboard status and control register performs the following
functions:
• Flags keyboard interrupt requests
• Acknowledges keyboard interrupt requests
• Masks keyboard interrupt requests
• Controls keyboard latch triggering sensitivity
Bit 7
6
5
4
3
2
1
Bit 0
KBSCR ^Read:
0
$001B _Write:
0
0
0
KEYF
0
IMASKK MODEK
ACKK
Reset: 0
0
0
0
0
0
0
0
= Unimplemented
Figure 6. Keyboard status and control register (KBSCR)
Bits 7–4 — Not used
These read-only bits always read as logic zeros.
KEYF — Keyboard flag bit
This read-only bit is set when a keyboard interrupt is pending. Reset
clears the KEYF bit.
1 = Keyboard interrupt pending
0 = No keyboard interrupt pending
MC68HC08AZ32
318
Keyboard Module (KB)
6-kbd
MOTOROLA