MC68HC681P 데이터 시트보기 (PDF) - Motorola => Freescale

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MC68HC681P

DUAL ASYNCHRONOUS RECEIVER/TRANSMITTER (DUART)™

Motorola => Freescale 

TABLE OF CONTENTS

Paragraph

Number

Title

Page

Number

Section 1

Introduction

1.1

Internal Control Logic ........................................................................... 1-4

1.2

Timing Logic ......................................................................................... 1-4

1.3

Interrupt Control Logic.......................................................................... 1-5

1.4

Data Bus Buffer .................................................................................... 1-5

1.5

Communication Channels A and B ...................................................... 1-5

1.6

Input Port.............................................................................................. 1-5

1.7

Output Port ........................................................................................... 1-6

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

2.10

2.11

2.12

2.13

2.14

2.14.1

2.14.2

2.14.3

2.14.4

2.14.5

2.14.6

2.15

2.15.1

2.15.2

2.15.3

2.15.4

Section 2

Signal Descriptions

VCC and GND ....................................................................................... 2-2

Crystal Input or External CLOCK (X1).................................................. 2-2

Crystal Input (X2) ................................................................................. 2-3

RESET (RESET) .................................................................................. 2-3

Chip-Select (CS) .................................................................................. 2-3

Read/Write (R/W) ................................................................................. 2-3

Data Transfer Ackowledge (DTACK) ................................................... 2-4

Register-Select Bus (RS1–RS4) .......................................................... 2-4

Data Bus (D0–D7) ................................................................................ 2-4

Interupt Request (IRQ) ......................................................................... 2-4

Interupt Ackowledge (IACK) ................................................................. 2-4

Channel A/B Transmitter Serial-Data Output (TxDA/TxDB)................. 2-4

Channel A/B Receiver Serial-Data Input (RxDA/RxDB)....................... 2-4

Parallel Inputs (IP0–IP5) ...................................................................... 2-4

IP0 .............................................................................................. 2-4

IP1 .............................................................................................. 2-5

IP2 .............................................................................................. 2-5

IP3 .............................................................................................. 2-5

IP4 .............................................................................................. 2-5

IP5 .............................................................................................. 2-5

Parallel Outputs (OP0–OP7) ................................................................ 2-5

OP0 ............................................................................................ 2-5

OP1 ............................................................................................ 2-5

OP2 ............................................................................................ 2-6

OP3 ............................................................................................ 2-6

MOTOROLA

MC68HC681 USER’S MANUAL

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