
MOTOROLA
Contents
xix
CONTENTS
Paragraph
Number
Title
Page
Number
19.3.5.2
19.3.6
19.3.6.1
19.3.7
19.3.8
19.3.8.1
19.3.8.2
19.3.8.3
19.3.8.4
19.3.8.5
19.3.9
Asynchronous Protocols ..........................................................................19-21
Digital Phase-Locked Loop (DPLL) Operation...........................................19-22
Encoding Data with a DPLL....................................................................19-24
Clock Glitch Detection.................................................................................19-26
Reconfiguring the SCCs...............................................................................19-26
General Reconfiguration Sequence for an SCC Transmitter...................19-26
Reset Sequence for an SCC Transmitter..................................................19-27
General Reconfiguration Sequence for an SCC Receiver .......................19-27
Reset Sequence for an SCC Receiver......................................................19-27
Switching Protocols .................................................................................19-27
Saving Power ...............................................................................................19-27
Chapter 20
SCC UART Mode
20.1
20.2
20.3
20.4
20.5
20.6
20.7
20.8
20.9
20.10
20.11
20.12
20.13
20.14
20.15
20.16
20.17
20.18
20.19
20.20
20.21
20.22
Features..............................................................................................................20-2
Normal Asynchronous Mode.............................................................................20-3
Synchronous Mode.............................................................................................20-3
SCC UART Parameter RAM.............................................................................20-4
Data-Handling Methods: Character- or Message-Based....................................20-5
Error and Status Reporting.................................................................................20-6
SCC UART Commands.....................................................................................20-6
Multidrop Systems and Address Recognition....................................................20-7
Receiving Control Characters............................................................................20-8
Hunt Mode (Receiver)......................................................................................20-10
Inserting Control Characters into the Transmit Data Stream...........................20-10
Sending a Break (Transmitter).........................................................................20-11
Sending a Preamble (Transmitter)....................................................................20-11
Fractional Stop Bits (Transmitter)....................................................................20-11
Handling Errors in the SCC UART Controller................................................20-12
UART Mode Register (PSMR)........................................................................20-13
SCC UART Receive Buffer Descriptor (RxBD) .............................................20-15
SCC UART Transmit Buffer Descriptor (TxBD)............................................20-18
SCC UART Event Register (SCCE) and Mask Register (SCCM)..................20-19
SCC UART Status Register (SCCS)................................................................20-21
SCC UART Programming Example................................................................20-22
S-Records Loader Application.........................................................................20-23