Mpc8Xx Serial Communications Interface - Motorola MBX Series Installation And Use Manual

header (J27) on the surface of the MBX board (as illustrated in
page 6-2).
Refer to
assignments of LCD connector J27. Refer to the PowerPC MPC821
Portable Systems Microprocessor User's Manual for detailed
programming information.
MPC8 xx Serial Communications Interface
The MPC8xx processor chip used on MBX series embedded controllers
has a versatile communications interface with Time Slot Allocator (TSA)
and Time Division Multiplexing (TDM) channels to support multiplexed
as well as non-multiplexed serial I/O. The Time Slot Allocator can route
any of the Serial Communication Controller channels (SCC2–SCC4) or
Serial Management Controller channels (SMC1–SMC2) to the TDM
channel to support communication links that require time division
multiplexing.
To implement a specific communication protocol at the physical layer, it is
necessary to connect the appropriate transceivers to the MBX board. The
8xx/COMM connector (P1), a 144-pin socket, is furnished for that
purpose. All necessary TDM signals, including clocks, are routed to the
8xx/COMM connector so that a user-supplied add-on card with transceiver
circuitry for the desired communication functions can be attached there.
Signals from SCCs 2–4, SMCs 1–2, the Serial Peripheral Interface (SPI),
and the Interprocessor-Integrated Controller (I
8xx/COMM connector.
Note
The TDM capability of the serial interface does not prevent you from
operating the serial channels in standard non-multiplexed fashion. A mix
of TDM (multiplexed) and non-multiplexed channels, or the
implementation of additional EIA-232 channels, would be equally
feasible.
http://www.motorola.com/computer/literature
LCD & SPI Connector J27 (MBX821) on page 6-22
Using the MPC8xx processor's parallel port in an application
makes the SMC2 and SPI interface signals unavailable at the
8xx/COMM connector. However, the remaining serial channels
with TDM capability (SCC2–SCC4 and SMC1) are still present
at that connector.

MPC8xx Serial Communications Interface

2
C) are all available at the
Figure on
for the pin
5
5-17