MC68HC08AZ32A Datasheet, PDF (104/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Keyboard Interrupt (KBD) Module
ACKK — Keyboard Acknowledge Bit
Writing a 1 to this write-only bit clears the keyboard interrupt request. ACKK always reads as 0. Reset
clears ACKK.
IMASKK — Keyboard Interrupt Mask Bit
Writing a 1 to this read/write bit prevents the output of the keyboard interrupt mask from generating
interrupt requests. Reset clears the IMASKK bit.
1 = Keyboard interrupt requests masked
0 = Keyboard interrupt requests not masked
MODEK — Keyboard Triggering Sensitivity Bit
This read/write bit controls the triggering sensitivity of the keyboard interrupt pins. Reset clears
MODEK.
1 = Keyboard interrupt requests on falling edges and low levels
0 = Keyboard interrupt requests on falling edges only
8.7.2 Keyboard Interrupt Enable Register
The keyboard interrupt enable register enables or disables each port G and each port H pin to operate as
a keyboard interrupt pin.
Address: $0021
Bit 7
6
Read: 0
0
Write:
5
4
3
2
1
0
KBIE4 KBIE3 KBIE2 KBIE1
Reset: 0
0
0
0
0
0
0
= Unimplemented
Figure 8-5. Keyboard Interrupt Enable Register (KBIER)
Bit 0
KBIE0
0
KBIE4–KBIE0 — Keyboard Interrupt Enable Bits
Each of these read/write bits enable the corresponding keyboard interrupt pin to latch interrupt
requests. Reset clears the keyboard interrupt enable register.
1 = Port pin enabled as keyboard interrupt pin
0 = Port pin not enabled as keyboard interrupt pin
MC68HC08AZ32A Data Sheet, Rev. 2
104
Freescale Semiconductor