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Communication Processor Module
CSEL—Channel Select
000 = The bit/byte group is not supported by the MPC823e. The transmit data pin is
three-stated and the receive data pin is ignored.
001 = Reserved.
010 = The bit/byte group is routed to SCC2.
011 = The bit/byte group is routed to SCC3.
100 = Reserved.
101 = The bit/byte group is routed to SMC1.
110 = The bit/byte group is routed to SMC2.
111 = The bit/byte group is not supported by the MPC823e. This code is also used
in the SCIT mode as the D channel grant.
CNT—Count
This value indicates the number of bits/bytes (according to the BYT bit) that the routing and
strobe select of this entry controls. If CNT = 0000, then 1 bit/byte is chosen and if
CNT = 1111 16 bits/bytes are selected.
BYT—Byte Resolution
0 = Bit resolution. The value of CNT indicates the number of bits in this group.
1 = Byte resolution. The value of CNT indicates the number of bytes in this group.
LST—Last Entry in the RAM
Whenever the serial interface RAM is used, this bit must be set in one of the transmit or
receive entries of each group. Even if all entries of a group are used, this bit must still be set
in the last entry.
0 = This is not the last entry in this section of the route RAM.
1 = This is the last entry in this RAM. After this entry, the serial interface waits for the
sync signal to start the next frame.
Note: If a second sync signal is received before the end of a frame (as defined by the
last serial interface RAM entry), an error occurs. The serial interface will
terminate RAM processing and cease transmitting or receiving data until a third
sync signal is received.
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MPC823e REFERENCE MANUAL
MOTOROLA
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