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Communications Processor (CP)
OPCODE—Command Opcode
These bits are set by the M68000 core to define the specific SCC command. The precise
meaning of each command below depends on the protocol chosen.
00 = STOP TRANSMIT Command
01 = RESTART TRANSMIT Command
10 = ENTER HUNT MODE Command
11 = RESET RECEIVER BCS CALCULATION (used only in BISYNC mode)
The detailed command description for the UART protocol is presented in 4.5.11 UART
Controller.
The detailed command description for the HDLC protocol is presented in 4.5.12 HDLC
Controller.
The detailed command description for the BISYNC protocol is presented in 4.5.13 BI-
SYNC Controller.
The detailed command description for the DDCMP protocol is presented in 4.5.14 DDC-
MP Controller.
The detailed command description for the V.110 protocol is presented in 4.5.15 V.110
Controller.
The detailed command description for the transparent protocol is presented in 4.5.16
Transparent Controller.
1 = When GCI is set in conjunction with the opcode bits, the two GCI commands
(ABORT REQUEST and TIMEOUT) are generated. The accompanying CH. NUM.
should be 10, and FLG should be set.
OPCODE—Command Opcode (GCI Mode Only)
These bits are set by the M68000 core to define the specific GCI command. See 4.7 Serial
Management Controllers (SMCs) for more details.
00 = TRANSMIT ABORT REQUEST; the GCI receiver sends an abort request on the
E bit.
01 = TIMEOUT Command
10 = Reserved
11 = Reserved
Bit 3—Reserved bit; should be set to zero.
CH. NUM.—Channel Number
These bits are set by the M68000 core to define the specific SCC channel that the com-
mand is to operate upon.
00 = SCC1
01 = SCC2
10 = SCC3
11 = Reserved
4-6
MC68302 USER'S MANUAL
MOTOROLA
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