SC9RS08KA2 datasheet(53/134 Pages) FREESCALE

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Chapter 7 Keyboard Interrupt (RS08KBIV1)

SC9RS08KA2 Series Data Sheet, Rev. 1

Freescale Semiconductor

7.3

The KBI includes three registers:

•

An 8-bit pin status and control register

•

An 8-bit pin enable register

•

An 8-bit edge select register

Refer to the direct-page register summary in Chapter 4, “Memory,” for the absolute address assignments

for all KBI registers. This section refers to registers and control bits only by their names.

The KBI registers are summarized in Table 7-2.

7.3.1

KBI Status and Control Register (KBISC)

KBISC contains the status flag and control bits, which are used to configure the KBI.

Table 7-2. KBI Register Summary

Name

7654

KBISC

000

KBF

KBIE

KBMOD

KBACK

KBIPE

KBIPE5

KBIPE4

KBIPE2

KBIPE1

KBIPE0

KBIES

KBEDG5 KBEDG4

KBEDG2 KBEDG1 KBEDG0

765

210

KBF

KBIE

KBMOD

KBACK

Reset:

000

= Unimplemented

Figure 7-3. KBI Status and Control Register (KBISC)

Table 7-3. KBISC Register Field Descriptions

Field

Description

KBF

Keyboard Interrupt Flag — KBF indicates that a keyboard interrupt is detected. Writes have no effect on KBF.

0 No keyboard interrupt detected.

1 Keyboard interrupt detected.

KBACK

Keyboard Acknowledge — Writing a 1 to KBACK is part of the flag-clearing mechanism. KBACK always reads

as 0.

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