HCS08 datasheet(139/198 Pages) NXP

139 / 198 page

Keyboard Interrupts (S08KBIV2)

MC9S08QD4 Series MCU Data Sheet, Rev. 6

Freescale Semiconductor

139

10.3.2

KBI Pin Enable Register (KBIPE)

KBIPE contains the pin enable control bits.

10.3.3

KBI Edge Select Register (KBIES)

KBIES contains the edge select control bits.

765

210

KBF

KBIE

KBMOD

KBACK

Reset:

000

= Unimplemented

Figure 10-3. KBI Status and Control Register

Table 10-2. KBISC Register Field Descriptions

Field

Description

7:4

Unused register bits, always read 0.

KBF

Keyboard Interrupt Flag — KBF indicates when 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.

KBIE

Keyboard Interrupt Enable — KBIE determines whether a keyboard interrupt is requested.

0 Keyboard interrupt request not enabled.

1 Keyboard interrupt request enabled.

KBMOD

Keyboard Detection Mode — KBMOD (along with the KBEDG bits) controls the detection mode of the keyboard

interrupt pins.0Keyboard detects edges only.

1 Keyboard detects both edges and levels.

765

210

KBIPE7

KBIPE6

KBIPE5

KBIPE4

KBIPE3

KBIPE2

KBIPE1

KBIPE0

Reset:

000

Figure 10-4. KBI Pin Enable Register

Table 10-3. KBIPE Register Field Descriptions

Field

Description

7:0

KBIPEn

Keyboard Pin Enables — Each of the KBIPEn bits enable the corresponding keyboard interrupt pin.

0 Pin not enabled as keyboard interrupt.

1 Pin enabled as keyboard interrupt.

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