¡ Semiconductor
MSM82C51A-2RS/GS/JS
Status Word
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.
D7
D6
D5
D4
D3
D2
D1
D0
DSR
SYNDET
/BD
FE
OE
PE TXEMPTY RXRDY 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 , D0 to D7, 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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