HCS08 datasheet(138/198 Pages) NXP

138 / 198 page

Keyboard Interrupts (S08KBIV2)

MC9S08QD4 Series MCU Data Sheet, Rev. 6

138

Freescale Semiconductor

Figure 10-2. KBI Block Diagram

10.2

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 10-1.

10.3

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.

10.3.1

KBI Status and Control Register (KBISC)

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

Table 10-1. 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

KBIP0

KBIPn

KBI

INTERRU

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