¡ Semiconductor
2) Command
MSM82C51A-2RS/GS/JS
Command is used for setting the operation of the MSM82C51A-2.
It is possible to write a command whenever necessary after writing a mode instruction and
sync characters.
Items to be set by command are as follows:
•
•
•
•
•
•
•
Transmit
Enable/Disable
Receive Enable/Disable
DTR, RTS
Output of data.
Resetting of error flag.
Sending to break characters
Internal resetting
Hunt mode (synchronous mode)
The bit configuration of a command is shown in Fig. 4.
D
7
EH
D
6
IR
D
5
RTS
D
4
ER
D
3
SBRK
D
2
RXE
D
1
DTR
D
0
TXEN
1ºTransmit Enable
0ºDisable
DTR
1
Æ
DTR
= 0
0
Æ
DTR
= 1
1ºRecieve Enable
0ºDisable
1ºSent Break Charactor
0ºNormal Operation
1ºReset Error Flag
0ºNormal Operation
RTS
1
Æ
RTS
= 0
0
Æ
RTS
= 1
1ºInternal Reset
0ºNormal Operation
1ºHunt Mode (Note)
0ºNormal Operation
Note:
Seach mode for synchronous
charactors in synchronous mode.
Fig. 4 Bit Configuration of Command
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