M68ICS08GR datasheet(205/408 Pages) FREESCALE

205 / 408 page

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Input/Output Ports (I/O)

205

Technical Data — MC68HC908GR8

Section 16. Input/Output Ports (I/O)

16.1 Contents

16.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

16.3

Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

16.4

Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

16.5

Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

16.6

Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

16.7

Port E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

16.2 Introduction

Twenty one (21) bidirectional input-output (I/O) pins form five parallel

ports. All I/O pins are programmable as inputs or outputs. All individual

bits within port A, port C, and port D are software configurable with pullup

devices if configured as input port bits. The pullup devices are

automatically and dynamically disabled when a port bit is switched to

output mode.

NOTE:

Connect any unused I/O pins to an appropriate logic level, either VDD or

VSS. Although the I/O ports do not require termination for proper

operation, termination reduces excess current consumption and the

possibility of electrostatic damage.

Freescale Semiconductor, Inc.

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Go to: www.freescale.com

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