MC908QT4MPE datasheet(52/184 Pages) FREESCALE

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Auto Wakeup Module (AWU)

MC68HC908QY/QT Family Data Sheet, Rev. 5

Freescale Semiconductor

Bits 7–4 — Not used

These read-only bits always read as 0s.

KEYF — Keyboard Flag Bit

This read-only bit is set when a keyboard interrupt is pending on port A or auto wakeup. Reset clears

the KEYF bit.

1 = Keyboard/auto wakeup interrupt pending

0 = No keyboard/auto wakeup interrupt pending

ACKK — Keyboard Acknowledge Bit

Writing a 1 to this write-only bit clears the keyboard/auto wakeup interrupt request on port A and auto

wakeup logic. 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 on port A or auto wakeup. Reset clears the IMASKK bit.

1 = Keyboard/auto wakeup interrupt requests masked

0 = Keyboard/auto wakeup interrupt requests not masked

NOTE

MODEK is not used in conjuction with the auto wakeup feature. To see a

description of this bit, see 9.7.1 Keyboard Status and Control Register.

4.6.3 Keyboard Interrupt Enable Register

The keyboard interrupt enable register (KBIER) enables or disables the auto wakeup to operate as a

keyboard/auto wakeup interrupt input.

AWUIE — Auto Wakeup Interrupt Enable Bit

This read/write bit enables the auto wakeup interrupt input to latch interrupt requests. Reset clears

AWUIE.

1 = Auto wakeup enabled as interrupt input

0 = Auto wakeup not enabled as interrupt input

NOTE

KBIE5–KBIE0 bits are not used in conjuction with the auto wakeup feature.

To see a description of these bits, see 9.7.2 Keyboard Interrupt Enable

Address: $001B

Bit 7

654321

Bit 0

Read:

AWUIE

KBIE5

KBIE4

KBIE3

KBIE2

KBIE1

KBIE0

Write:

Reset:

00000000

= Unimplemented

Figure 4-4. Keyboard Interrupt Enable Register (KBIER)

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