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SCC Programming Reference
OPCODE—Command Opcode
00 = STOP TRANSMlT Command.
01 = RESTART TRANSMIT Command.
10 = ENTER HUNT MODE Command.
11 = Reset receiver BCS generator (used only in BISYNC mode).
BIT 3—Reserved (should be set to zero by the user when the command register is written)
CH. NUM.—Channel Number
00 = SCC1.
01 = SCC2.
10 = SCC3.
11 = Reserved.
FLG—Command Semaphore Flag (set by the user and cleared by the CP upon command
completion)
0 = CP is ready to receive a new command (should be checked before issuing the next
command to the CP)
1= Command register contains a command to be executed or one that is currently be-
ing executed.
E.1.1.1.2 Serial Interface Mode Register (SIMODE). This 16-bit register is located at off-
set $8B4. The SIMODE register is used to configure the serial interface mode for the three
SCCs.
15
14
SETZ
SYNC/SCIT
7
6
B1RB
B1RA
SETZ—Set L1 TXD to Zero (valid only for the GCI interface)
0 = Normal operation.
1 = L1 TXD output set to a logic zero (used in GCI activation).
SYNC/SCIT—SYNC Mode/SClT Select Support
0 = One pulse wide prior to the 8-bit data.
1 = N pulses wide and envelopes the N-bit data.
SDIAG1, SDIAG0—Serial Interface Diagnostic Mode
00 = Normal operation.
01 = Automatic echo.
10 = Internal loopback.
11 = Loopback control.
E-4
13
12
SDIAG1
SDIAG0
5
4
DRB
DRA
MC68360 USER'S MANUAL
11
10
SDC2
SDC1
3
2
MSC3
MSC2
9
8
B2RB
B2RA
1
0
MS1
MS0
MOTOROLA
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