HCS08 datasheet(128/374 Pages) NXP

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Keyboard Interrupts (S08KBIV2)

MC9S08JM60 Series Data Sheet, Rev. 5

128

Freescale Semiconductor

Figure 9-2. KBI Block Diagram

9.2

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 9-1.

9.3

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 the Memory chapter for the absolute address assignments for

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

Some MCUs may have more than one KBI, so register names include placeholder characters to identify

which KBI is being referenced.

9.3.1

KBI Status and Control Register (KBISC)

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

Table 9-1. 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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