
10/31/95
SECTION 1: OVERVIEW
UM Rev 1
MOTOROLA
MC68341 USER'S MANUAL
xiii
TABLE OF CONTENTS (Continued)
Paragraph
Page
Number
Title
Number
6.7.7
Module Configuration Register (MCR) ................................................ 6-33
6.7.8
Source Address Register (SAR) .......................................................... 6-35
6.8
Data Packing ........................................................................................... 6-36
6.9
DMA Channel Initialization Sequence ..................................................... 6-36
6.9.1
DMA Channel Configuration ................................................................ 6-37
6.9.1.1
DMA Channel Operation In Single-Address Mode .......................... 6-38
6.9.1.2
DMA Channel Operation In Dual-Address Mode ............................. 6-39
6.9.2
DMA Channel Example Configuration Code ....................................... 6-40
6.10
MC68341 DMA Enhancements............................................................... 6-47
6.10.1
RDY≈ ................................................................................................... 6-47
6.10.2
Delayed DACK≈ ................................................................................... 6-47
6.10.3
DTC ..................................................................................................... 6-47
6.10.4
Timing Examples ................................................................................. 6-48
Section 7
Serial Module
7.1
Module Overview ................................................................................ 7-2
7.1.1
Serial Communication Channels A and B........................................ 7-3
7.1.2
Baud Rate Generator Logic ............................................................. 7-3
7.1.3
Internal Channel Control Logic ........................................................ 7-3
7.1.4
Interrupt Control Logic ..................................................................... 7-3
7.1.5
Comparison of the Serial Module to the 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
7.2.9
Channel B Request-To-Send (RTSB ).............................................. 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
7.2.13
Channel A Receiver Ready (R≈RDYA) ............................................ 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 ................................................................................... 7-13
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.