SC9RS08KA2 datasheet(52/134 Pages) FREESCALE

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Chapter 7 Keyboard Interrupt (RS08KBIV1)

SC9RS08KA2 Series Data Sheet, Rev. 1

Freescale Semiconductor

7.1.2

Modes of Operation

This section defines the KBI operation in wait, stop, and background debug modes.

7.1.2.1

Operation in Wait Mode

The KBI continues to operate in wait mode if enabled before executing the WAIT instruction. Therefore,

an enabled KBI pin (KBPEn = 1) can be used to bring the MCU out of wait mode if the KBI interrupt is

enabled (KBIE = 1).

7.1.2.2

Operation in Stop Mode

The KBI operates asynchronously in stop mode if enabled before executing the STOP instruction.

Therefore, an enabled KBI pin (KBPEn = 1) can be used to bring the MCU out of stop mode if the KBI

interrupt is enabled (KBIE = 1).

7.1.2.3

Operation in Active Background Mode

When the microcontroller is in active background mode, the KBI will continue to operate normally.

7.1.3

Block Diagram

The block diagram for the keyboard interrupt module is shown Figure 7-2.

Figure 7-2. Keyboard Interrupt (KBI) Block Diagram

7.2

External Signal Description

The KBI input pins can be used to detect either falling edges, or both falling edge and low level interrupt

requests. The KBI input pins can also be used to detect either rising edges, or both rising edge and high

level interrupt requests.

The signal properties of KBI are shown in Table 7-1.

Table 7-1. Signal Properties

Signal

Function

I/O

KBIPn

Keyboard interrupt pins

CLR

VDD

KBMOD

KBIE

KEYBOARD

INTERRUPT FF

KBACK

RESET

SYNCHRONIZER

KBF

STOP BYPASS

STOP

BUSCLK

KBIPEn

KBEDGn

KBIPE0

KBEDG0

KBI

INTERRUPT

REQUEST

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