MC68340 datasheet(14/441 Pages) FREESCALE

14 / 441 page

11/2/95

SECTION 1: OVERVIEW

UM Rev 1

MOTOROLA

MC68340 USER'S MANUAL

xiii

TABLE OF CONTENTS (Continued)

Paragraph

Page

Number

Title

Number

7.1.5

Comparison of Serial Module to MC68681 .............................................7-4

7.2

Serial Module Signal Definitions...................................................................7-4

7.2.1

Crystal Input or External Clock (X1) ..........................................................7-5

7.2.2

Crystal Output (X2) .......................................................................................7-5

7.2.3

External Input (SCLK)..................................................................................7-6

7.2.4

Channel A Transmitter Serial Data Output (TxDA).................................7-6

7.2.5

Channel A Receiver Serial Data Input (RxDA)........................................7-6

7.2.6

Channel B Transmitter Serial Data Output (TxDB).................................7-6

7.2.7

Channel B Receiver Serial Data Input (RxDB)........................................7-6

7.2.8

Channel A Request-To-Send (

RTSA) ......................................................7-6

7.2.8.1

RTSA...........................................................................................................7-6

7.2.8.2

OP0..............................................................................................................7-6

7.2.9

Channel B Request-To-Send (

RTSB).......................................................7-6

7.2.9.1

RTSB...........................................................................................................7-7

7.2.9.2

OP1..............................................................................................................7-7

7.2.10

Channel A Clear-To-Send (

CTSA) ...........................................................7-7

7.2.11

Channel B Clear-To-Send (

CTSB)............................................................7-7

7.2.12

Channel A Transmitter Ready (

≈RDYA).................................................7-7

7.2.12.1

≈RDYA......................................................................................................7-7

7.2.12.2

OP6..............................................................................................................7-7

7.2.13

Channel A Receiver Ready (

≈RDYA).....................................................7-7

7.2.13.1

≈RDYA......................................................................................................7-7

7.2.13.2

FFULLA.......................................................................................................7-7

7.2.13.3

OP4..............................................................................................................7-7

7.3

Operation............................................................................................................7-8

7.3.1

Baud Rate Generator ...................................................................................7-8

7.3.2

Transmitter and Receiver Operating Modes ............................................7-8

7.3.2.1

Transmitter .................................................................................................7-10

7.3.2.2

Receiver......................................................................................................7-11

7.3.2.3

FIFO Stack..................................................................................................7-12

7.3.3

Looping Modes .............................................................................................7-14

7.3.3.1

Automatic Echo Mode..............................................................................7-14

7.3.3.2

Local Loopback Mode .............................................................................7-14

7.3.3.3

Remote Loopback Mode .........................................................................7-14

7.3.4

Multidrop Mode .............................................................................................7-15

7.3.5

Bus Operation................................................................................................7-17

7.3.5.1

Read Cycles...............................................................................................7-17

7.3.5.2

Write Cycles...............................................................................................7-17

7.3.5.3

Interrupt Acknowledge Cycles................................................................7-17

7.4

7.4.1

7.4.1.1

Module Configuration Register (MCR)..................................................7-19

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