
MOTOROLA
Contents
xxiii
CONTENTS
Paragraph
Number
Title
Page
Number
23.14.6
23.14.6.1
23.14.6.2
HDLC Bus Protocol Programming..............................................................23-22
Programming GSMR and PSMR for the HDLC Bus Protocol................23-22
HDLC Bus Controller Programming Example........................................23-23
Chapter 24
SCC AppleTalk Mode
24.1
24.2
24.3
24.4
24.4.1
24.4.2
24.4.3
24.4.4
Operating the LocalTalk Bus.............................................................................24-1
Features..............................................................................................................24-2
Connecting to AppleTalk...................................................................................24-3
Programming the SCC in AppleTalk Mode.......................................................24-3
Programming the GSMR................................................................................24-3
Programming the PSMR................................................................................24-4
Programming the TODR................................................................................24-4
SCC AppleTalk Programming Example........................................................24-4
Chapter 25
SCC Asynchronous HDLC Mode
25.1
25.2
25.3
25.4
25.5
25.6
25.7
25.8
25.9
25.9.1
25.9.2
25.10
25.11
25.12
25.13
25.13.1
Asynchronous HDLC Features..........................................................................25-1
Asynchronous HDLC Frame Transmission Processing.....................................25-2
Asynchronous HDLC Frame Reception Processing..........................................25-2
Transmitter Transparency Encoding..................................................................25-3
Receiver Transparency Decoding ......................................................................25-3
Exceptions to RFC 1549 ....................................................................................25-4
Asynchronous HDLC Channel Implementation................................................25-5
Asynchronous HDLC Mode Parameter RAM...................................................25-5
Configuring GSMR and DSR for Asynchronous HDLC...................................25-6
General SCC Mode Register (GSMR)...........................................................25-6
Data Synchronization Register (DSR)...........................................................25-7
Programming the Asynchronous HDLC Controller...........................................25-7
Asynchronous HDLC Commands......................................................................25-7
Handling Errors in the Asynchronous HDLC Controller...................................25-8
SCC Asynchronous HDLC Registers ................................................................25-9
Asynchronous HDLC Event Register (SCCE)/Asynchronous HDLC
Mask Register (SCCM)..............................................................................25-9
SCC Asynchronous HDLC Status Register (SCCS)....................................25-10
Asynchronous HDLC Mode Register (PSMR)............................................25-11
SCC Asynchronous HDLC RxBDs..................................................................25-11
SCC Asynchronous HDLC TxBDs..................................................................25-13
Differences between HDLC and Asynchronous HDLC..................................25-14
SCC Asynchronous HDLC Programming Example........................................25-15
25.13.2
25.13.3
25.14
25.15
25.16
25.17