Typewriter User Manual

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 (
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
7.2.13.1
R≈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 Register Description and Programming ....................................................... 7-17
7.4.1 Register Description..................................................................................... 7-17
7.4.1.1 Module Configuration Register (MCR).................................................. 7-19
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cale Semiconductor,
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