Freescale Semiconductor PowerQUICC MPC885 Reference Manual page 647

Chapter 21
Serial Communications Controllers
This chapter describes the SCCs as specifically implemented on the MPC885. To ensure proper
implementation of other derivatives of the MPC885 family,
the fundamental differences. The appropriate appendix for each derivative should be consulted for further
information.
Part SCCs
MPC885
MPC880
MPC875
MPC870
The MPC885 has three serial communications controllers (SCCs), which can be configured independently
to implement different protocols for bridging functions, routers, and gateways, and to interface with a wide
variety of standard WANs, LANs, and proprietary networks. An SCC has many physical interface options
such as interfacing to a TDM bus, an ISDN bus, or a standard modem interface.
The SCCs are independent from the physical interface, but SCC logic formats and manipulates data from
the physical interface. Furthermore, the choice of protocol is independent from the choice of interface. An
SCC is described in terms of the protocol it runs. When an SCC is programmed to a certain protocol or
mode, it implements functionality that corresponds to parts of the protocol's link layer (layer 2 of the OSI
reference model). Many SCC functions are common to protocols of the following controllers:
• UART, described in
• HDLC and HDLC bus, described in
• AppleTalk/LocalTalk, described in
• IrDA or asynchronous HDLC, described in
IrDA."
• BISYNC, described in
• Ethernet, described in
• Transparent, described in
Although the selected protocol usually applies to both the SCC transmitter and receiver, one half of an SCC
can run transparent operations while the other half runs a standard protocol (except Ethernet and serial
ATM as applicable).
Freescale Semiconductor
Table 21-1. MPC885 Family
3
2
1
0
Chapter 22, "SCC UART Mode."
Chapter 23, "SCC HDLC Mode."
Chapter 24, "SCC AppleTalk Mode."
Chapter 26, "SCC BISYNC Mode."
Chapter 27, "SCC Ethernet Mode."
Chapter 28, "SCC Transparent Mode."
MPC885 PowerQUICC Family Reference Manual, Rev. 2
Table 21-1 is provided as a quick reference of
Documentation
This manual
Appendix E
Appendix F
Appendix G
Chapter 25, "SCC Asynchronous HDLC Mode and
21-1