Table of Contents
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11/2/95
TABLE OF CONTENTS (Continued)
Paragraph
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
RTSA ........................................................................................................... 7-6
7.2.8.1
7.2.8.2
OP0.............................................................................................................. 7-6
7.2.9
Channel B Request-To-Send ( RTSB )....................................................... 7-6
RTSB ........................................................................................................... 7-7
7.2.9.1
7.2.9.2
OP1.............................................................................................................. 7-7
7.2.10
Channel A Clear-To-Send ( CTSA ) ........................................................... 7-7
Channel B Clear-To-Send ( CTSB )............................................................ 7-7
7.2.11
7.2.12
Channel A Transmitter Ready ( T RDYA )................................................. 7-7
7.2.12.1
T RDYA ...................................................................................................... 7-7
7.2.12.2
OP6.............................................................................................................. 7-7
7.2.13
Channel A Receiver Ready ( R RDYA )..................................................... 7-7
R RDYA ...................................................................................................... 7-7
7.2.13.1
FFULLA ....................................................................................................... 7-7
7.2.13.2
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
Register Description and Programming ....................................................... 7-17
7.4.1
Register Description..................................................................................... 7-17
7.4.1.1
Module Configuration Register (MCR).................................................. 7-19
MOTOROLA
Freescale Semiconductor, Inc.
SECTION 1: OVERVIEW
Title
MC68340 USER'S MANUAL
For More Information On This Product,
Go to: www.freescale.com
UM Rev 1
P a g e
Number
xiii
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