MC68HC705P9CS datasheet(81/160 Pages) FREESCALE

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MC68HC705P9 — Rev. 4.0

Technical Data

MOTOROLA

Parallel Input/Output (I/O) Ports

Technical Data — MC68HC705P9

Section 7. Parallel Input/Output (I/O) Ports

7.1 Contents

7.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

7.3

Port A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

7.3.1

Port A Data Register (PORTA). . . . . . . . . . . . . . . . . . . . . . . 83

7.3.2

Data Direction Register A (DDRA) . . . . . . . . . . . . . . . . . . . .83

7.4

Port B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

7.4.1

Port B Data Register (PORTB). . . . . . . . . . . . . . . . . . . . . . . 85

7.4.2

Data Direction Register B (DDRB) . . . . . . . . . . . . . . . . . . . .86

7.5

Port C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

7.5.1

Port C Data Register (PORTC) . . . . . . . . . . . . . . . . . . . . . . 88

7.5.2

Data Direction Register C (DDRC) . . . . . . . . . . . . . . . . . . . .89

7.6

Port D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

7.6.1

Port D Data Register (PORTD) . . . . . . . . . . . . . . . . . . . . . . 91

7.6.2

Data Direction Register D (DDRD) . . . . . . . . . . . . . . . . . . . .92

7.2 Introduction

Twenty bidirectional pins and one input-only pin form four parallel

input/output (I/O) ports. All the bidirectional port pins are programmable

as inputs or outputs.

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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