¡ Semiconductor
Status Word
MSM82C51A-2RS/GS/JS
It is possible to see the internal status of MSM82C51A-2 by reading a status word.
The bit configuration of status word is shown in Fig. 5.
D
7
DSR
D
6
SYNDET
/BD
D
5
FE
D
4
OE
D
3
PE
D
2
TXEMPTY
D
1
RXRDY
D
0
TXRDY
Parity Different from
TXRDY Terminal.
Refer to "Explanation"
of TXRDY Terminals.
Same as terminal.
Refer to "Explanation"
of Terminals.
1ºParity Error
1ºOverrun Error
1ºFraming Error
Note:
Only asynchronous mode.
Stop bit cannot be detected.
Shows Terminal
DSR
1ºDSR = 0
0ºDSR = 1
Fig. 5 Bit Configuration of Status Word
Standby Status
It is possible to put the MSM82C51A-2 in “standby status”
When the following conditions have been satisfied the MSM82C51A-2 is in “standby status.”
(1)
CS
terminal is fixed at Vcc level.
(2) Input pins other
CS
, D
0
to D
7
,
RD, WR
and C/D are fixed at Vcc or GND level (including
SYNDET in external synchronous mode).
Note:
When all output currents are 0, ICCS specification is applied.
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