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Keyboard/External Interrupt Module (KBI)

Data Sheet

MC68HC908RF2 — Rev. 4.0

102

Keyboard/External Interrupt Module (KBI)

MOTOROLA

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 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

7.5.2 Keyboard Interrupt Enable Register

The keyboard interrupt enable register (INTKBIER) enables or disables each port

A pin to operate as a keyboard interrupt pin.

KBIE6–KBIE1 — Keyboard Interrupt Enable Bits

Each of these read/write bits enables the corresponding keyboard interrupt pin

to latch interrupt requests. These bits also enable the corresponding internal

pullup resistor which is enabled only when the bit is set. Reset clears the

keyboard interrupt enable register.

1 = PAx pin enabled as keyboard interrupt pin and corresponding internal

pullup resistor enabled

0 = PAx pin not enabled as keyboard interrupt pin and corresponding internal

pullup resistor disabled

NOTE:

Setting a keyboard interrupt enable bit (KBIEx) forces the corresponding keyboard

interrupt pin to be an input, overriding the data direction register. However, the data

direction register bit must be a 0 for software to read the pin.

Address: $001B

Bit 7

654321

Bit 0

Read:

KBIE6

KBIE5

KBIE4

KBIE3

KBIE2

KBIE1

Write:

Reset:

00000000

= Unimplemented

Figure 7-7. Keyboard Interrupt Enable Register (INTKBIER)

Freescale Semiconductor, Inc.

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