M68HC08 datasheet(101/188 Pages) FREESCALE

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Keyboard/External Interrupt Module (KBI)

I/O Registers

MC68HC908RF2 — Rev. 4.0

Data Sheet

MOTOROLA

Keyboard/External Interrupt Module (KBI)

101

7.5 I/O Registers

These registers control and monitor operation of the keyboard/external interrupt

module:

•

IRQ and keyboard status and control register, INTKBSCR

•

Keyboard interrupt enable register, KBIER

7.5.1 IRQ and Keyboard Status and Control Register

The IRQ and keyboard status and control register (INTKBSCR) controls and

monitors operation of the keyboard/external interrupt module. The INTKBSCR has

these functions:

•

Flags the keyboard interrupt requests

•

Acknowledges the keyboard interrupt requests

•

Masks the keyboard interrupt requests

•

Shows the state of the IRQ1 interrupt flag

•

Clears the IRQ interrupt latch

•

Masks the IRQ interrupt request

•

Controls the triggering sensitivity of the keyboard and IRQ interrupt pins

IRQ1F — IRQ Flag Bit

This read-only status bit is high when the IRQ interrupt is pending.

1 = IRQ interrupt pending

0 = IRQ interrupt not pending

ACKI — IRQ Interrupt Request Acknowledge Bit

Writing a 1 to this write-only bit clears the IRQ latch. ACKI always reads as 0.

Reset clears ACKI.

IMASKI — IRQ Interrupt Mask Bit

Writing a 1 to this read/write bit disables IRQ interrupt requests. Reset clears

IMASKI.

1 = IRQ interrupt requests disabled

0 = IRQ interrupt requests enabled

MODEI — IRQ Triggering Sensitivity Bit

This read/write bit controls the triggering sensitivity of the IRQ pin. Reset clears

MODEI.

1 = IRQ interrupt requests on falling edges and low levels

0 = interrupt requests on falling edges only

Address: $001A

Bit 7

654321

Bit 0

Read:

IRQ1F

IMASKI

MODEI

KEYF

IMASKK

MODEK

Write:

ACKI

ACKK

Reset:

00000000

R= Reserved

Figure 7-6. IRQ and Keyboard Status and Control Register (INTKBSCR)

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