HCS08 datasheet(151/290 Pages) MOTOROLA

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Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

151

MC9S08GB/GT

9.3 KBI Block Diagram

Figure 9-3 shows the block diagram for a KBI module.

Figure 9-3 KBI Block Diagram

The KBI module allows up to eight pins to act as additional interrupt sources. Four of these pins allow

falling-edge sensing while the other four can be configured for either rising-edge sensing or falling-edge

sensing. The sensing mode for all eight pins can also be modified to detect edges and levels instead of just

edges.

9.4 Keyboard Interrupt (KBI) Module

This on-chip peripheral module is called a keyboard interrupt (KBI) module because originally it was

designed to simplify the connection and use of row-column matrices of keyboard switches. However,

these inputs are also useful as extra external interrupt inputs and as an external means of waking up the

MCU from stop or wait low-power modes.

9.4.1 Pin Enables

The KBIPEn control bits in the KBIPE register allow a user to enable (KBIPEn = 1) any combination of

KBI-related port pins to be connected to the KBI module. Pins corresponding to 0s in KBIPE are

general-purpose I/O pins that are not associated with the KBI module.

9.4.2 Edge and Level Sensitivity

Synchronous logic is used to detect edges. Prior to detecting an edge, enabled keyboard inputs in a KBI

module must be at the deasserted logic level.

KEYBOARD

INTERRUPT

CLR

VDD

KBIMOD

KBIE

KEYBOARD

INTERRUPT FF

REQUEST

KBACK

RESET

SYNCHRONIZER

KBF

STOP BYPASS

STOP

BUSCLK

KBIPEn

KBEDGn

KBIPE0

KBIPE3

KBIPE4

KBEDG4

KBIP0

KBIP3

KBIP4

KBIPn

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