HCS08 datasheet(149/290 Pages) MOTOROLA

149 / 290 page

Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

149

MC9S08GB/GT

Section 9 Keyboard Interrupt (KBI) Module

9.1 Introduction

The MC9S08GB/GT has one KBI module with eight keyboard interrupt inputs that share port A pins. See

the Pins and Connections section for more information about the logic and hardware aspects of these

pins.

9.1.1 Port A and Keyboard Interrupt Pins

Figure 9-1 Port A Pin Names

The following paragraphs discuss controlling the keyboard interrupt pins.

Port A is an 8-bit port which is shared among the KBI keyboard interrupt inputs and general-purpose I/O.

The eight KBIPEn control bits in the KBIPE register allow selection of any combination of port A pins to

be assigned as KBI inputs. Any pins which are enabled as KBI inputs will be forced to act as inputs and

the remaining port A pins are available as general-purpose I/O pins controlled by the port A data (PTAD),

data direction (PTADD) and pullup enable (PTAPE) registers.

KBI inputs can be configured for edge-only sensitivity or edge-and-level sensitivity. Bits 3 through 0 of

port A are falling-edge/low-level sensitive while bits 7 through 4 can be configured for

rising-edge/high-level or for falling-edge/low-level sensitivity.

The eight PTAPEn control bits in the PTAPE register allow you to select whether an internal pullup device

is enabled on each port A pin that is configured as an input. When any of bits 7 through 4 of port A are

enabled as KBI inputs and are configured to detect rising edges/high levels, the pullup enable bits enable

pulldown rather than pullup devices.

An enabled keyboard interrupt can be used to wake the MCU from wait or standby (stop3).

9.2 Features

The keyboard interrupt (KBI) module features include:

•

Keyboard interrupts selectable on eight port pins:

–

Four falling edge/low level sensitive

–

Four falling edge/low level or rising edge/high level sensitive

–

Choice of edge-only or edge-and-level sensitivity

–

Common interrupt flag and interrupt enable control

–

Capable of waking up the MCU from stop3 or wait mode

MCU Pin:

PTA7/

KBIP7

PTA6/

KBIP6

PTA5/

KBIP5

PTA4/

KBIP4

PTA3/

KBIP3

PTA2/

KBIP2

PTA1/

KBIP1

PTA0/

KBIP0

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