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11/3/95
SECTION 1: OVERVIEW
UM Rev.1.0
xii
MC68349 USER’S MANUAL
MOTOROLA
TABLE OF CONTENTS (Continued)
Paragraph
Page
Number
Title
Number
7.6.3.1
Channel Termination...................................................................... 7-20
7.6.3.2
Interrupt Operation ......................................................................... 7-20
7.6.3.3
Fast Termination Option ................................................................ 7-21
7.7
Register Description.............................................................................. 7-22
7.7.1
Byte Transfer Counter Register (BTC) .............................................. 7-24
7.7.2
Channel Control Register (CCR) ....................................................... 7-24
7.7.3
Channel Status Register (CSR) ........................................................ 7-28
7.7.4
Destination Address Register (DAR) ................................................. 7-29
7.7.5
Function Code Register (FCR) .......................................................... 7-30
7.7.6
Interrupt Register (INTR) ................................................................... 7-31
7.7.7
Module Configuration Register (MCR) .............................................. 7-32
7.7.8
Source Address Register (SAR)........................................................ 7-34
7.8
Data Packing......................................................................................... 7-35
7.9
DMA Channel Initialization Sequence................................................... 7-35
7.9.1
DMA Channel Configuration.............................................................. 7-36
7.9.1.1
DMA Channel Operation in Single-Address Mode......................... 7-37
7.9.1.2
DMA Channel Operation in Dual-Address Mode ........................... 7-38
7.9.2
DMA Channel Example Configuration Code ..................................... 7-39
Section 8
Serial Module
8.1
Module Overview ................................................................................. 8-2
8.1.1
Serial Communication Channels A and B ......................................... 8-3
8.1.2
Baud Rate Generator Logic............................................................... 8-3
8.1.3
Internal Channel Control Logic .......................................................... 8-3
8.1.4
Interrupt Control Logic ....................................................................... 8-3
8.1.5
Comparison of the Serial Module to the MC68681............................ 8-4
8.2
Serial Module Signal Definitions ........................................................... 8-4
8.2.1
Crystal Input or External Clock (X1) .................................................. 8-5
8.2.2
Crystal Output (X2) ............................................................................ 8-5
8.2.3
External Input (SCLK) ...................................................................... 8-6
8.2.4
Channel A Transmitter Serial Data Output (TxDA) .......................... 8-6
8.2.5
Channel A Receiver Serial Data Input (RxDA) ................................. 8-6
8.2.6
Channel B Transmitter Serial Data Output (TxDB) .......................... 8-6
8.2.7
Channel B Receiver Serial Data Input (RxDB) ................................. 8-6
8.2.8
Channel A Request-To-Send (RTSA ) ............................................... 8-6
8.2.9
Channel B Request-To-Send (RTSB ) ............................................... 8-7
8.2.10
Channel A Clear-To-Send (CTSA ) ................................................... 8-7
8.2.11
Channel B Clear-To-Send (CTSB ) ................................................... 8-7
8.2.12
Channel A Transmitter Ready (T≈RDYA ) .......................................... 8-7
8.2.13
Channel A Receiver Ready (R≈RDYA) .............................................. 8-7
8.3
Operation .............................................................................................. 8-8