MC68HC908RK2 Datasheet, PDF (192/232 Pages) Motorola, Inc – Microcontroller Unit

Keyboard/External Interrupt Module (KBI)
ACKI — IRQ1 Interrupt Request Acknowledge Bit
Writing a logic 1 to this write-only bit clears the IRQ1 latch. ACKI
always reads as logic 0. Reset clears ACKI.
IMASKI — IRQ1 Interrupt Mask Bit
Writing a logic 1 to this read/write bit disables IRQ1 interrupt requests.
Reset clears IMASKI.
1 = IRQ1 interrupt requests disabled
0 = IRQ1 interrupt requests enabled
MODEI — IRQ1 Triggering Sensitivity Bit
This read/write bit controls the triggering sensitivity of the IRQ1 pin.
Reset clears MODEI.
1 = IRQ1 interrupt requests on falling edges and low levels
0 = interrupt requests on falling edges only
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
ACKK — Keyboard Acknowledge Bit
Writing a logic 1 to this write-only bit clears the keyboard interrupt
request. ACKK always reads as logic 0. Reset clears ACKK.
IMASKK — Keyboard Interrupt Mask Bit
Writing a logic 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
Advance Information
192
Keyboard/External Interrupt Module (KBI)
MC68HC908RK2 — Rev. 4.0
MOTOROLA