M68ICS08GR datasheet(182/408 Pages) FREESCALE

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Keyboard Interrupt (KBI)

Technical Data

MC68HC908GR8 — Rev 4.0

182

Keyboard Interrupt (KBI)

MOTOROLA

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

13.8.2 Keyboard Interrupt Enable Register

The keyboard interrupt enable register enables or disables each port A

pin to operate as a keyboard interrupt pin.

KBIE3–KBIE0 — Keyboard Interrupt Enable Bits

Each of these read/write bits enables the corresponding keyboard

interrupt pin to latch interrupt requests. Reset clears the keyboard

interrupt enable register.

1 = PTAx pin enabled as keyboard interrupt pin

0 = PTAx pin not enabled as keyboard interrupt pin

Address: $001B

Bit 7

654321

Bit 0

Read:

KBIE3

KBIE2

KBIE1

KBIE0

Write:

Reset:

0000

Figure 13-4. Keyboard Interrupt Enable Register (INTKBIER)

Freescale Semiconductor, Inc.

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