MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 455

• Manufacturer Part Number: MC68000
• Manufacturer: MOTOROLA [Motorola, Inc]

OPCODE—Command Opcode
Bit 3—Reserved (should be set to zero by the user when the command register is written)
CH. NUM.—Channel Number
FLG—Command Semaphore Flag (set by the user and cleared by the CP upon command
completion)
E.3.1.1.2 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 operation.
SETZ—Set L1TXD to Zero (valid only for the GCI interface)
SYNC/SCIT—SYNC Mode/SClT Select Support
SDIAG1, SDIAG0—Serial Interface Diagnostic Mode
MOTOROLA
SETZ
B1RB
00 = STOP TRANSMIT Command.
01 = RESTART TRANSMIT Command.
10 = ENTER HUNT MODE Command.
11 = Reset receiver BCS generator (used only in BISYNC mode).
00 = SCC1.
01 = SCC2.
10 = SCC3.
11 = Reserved.
0 = CP is ready to receive a new command (should be checked before issuing next
1 = Command register contains a command to be executed or one that is currently be-
0 = Normal Operation
1 = L1TXD output set to a logic zero (used in GCI activation)
0 = One pulse wide prior to the 8-bit data.
1 = N pulses wide and envelopes the N-bit data.
00 = Normal operation.
01 = Automatic Echo.
10 = Internal loopback.
11 = Loopback Control.
15
7
command to the CP).
ing executed.
SYNC/SCIT
B1RA
14
6
SDIAG1
DRB
13
5
MC68360 USER’S MANUAL
SDIAG0
DRA
12
4
MSC3
SDC2
11
3
MSC2
SDC1
10
2
SCC Programming Reference
B2RB
MS1
9
1
B2RA
MS0
0
8
E-33