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Communication Processor Module
RENC—Receiver Decoding Method
000 = NRZ (default setting if DPLL is not used).
001 = NRZI Mark (also set RINV for NRZI space).
010 = FM0 (also set RINV for FM1).
011 = Reserved.
100 = Manchester.
101 = Reserved.
110 = Differential Manchester (Differential Bi-phase-L).
111 = Reserved.
Note: Select NRZ if the DPLL is not used. You must program this bit to equal TENC in
most applications. However, do not use this internal DPLL for Ethernet mode.
TENC—Transmitter Encoding Method
000 = NRZ (default setting if DPLL is not used).
001 = NRZI Mark (also set TINV for NRZI space).
010 = FM0 (also set TINV for FM1).
011 = Reserved.
100 = Manchester.
101 = Reserved.
110 = Differential Manchester (Differential Bi-phase-L).
111 = Reserved.
Note: Select NRZ if the DPLL is not used. You must program this bit to equal RENC in
most applications. However, do not use this internal DPLL for Ethernet mode.
DIAG—Diagnostic Mode
The data received enters the RXDx pin and the transmit data is shifted out through the TXDx
pin. The serial communication controllers use the modem signals to automatically enable or
disable transmission and reception. These timings are shown in
Section 16.9.10 Controlling SCCx Timing .
In local loopback mode, the transmitter output is internally connected to the receiver input,
while the receiver and the transmitter operate normally. The value on the RXDx pin is
ignored. Data can be programmed to appear on the TXDx or the port A register can be
programmed to make the TXDx pin high. See Section 16.14 The Parallel I/O Ports for
more information. The RTSx pin can also be programmed to be disabled in the appropriate
parallel I/O register. In the SDMx field of the SIMODE register, the L1TXDx and L1RQx
signals can be programmed to be either asserted normally or to remain inactive. See
Section 16.7.5.2 Serial Interface Mode Register for more information.
16-174
MPC823e REFERENCE MANUAL
MOTOROLA
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