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SERIAL COMMUNICATION PROBLEM

LA p

this is my code for serial communication using 8051
iam trying to send letter B on serial port
but iam not getting any thig on heperterminal though all setting are ok .so not getting what the problem is.

 ORG 000H

     MOV  TMOD,#20H
     MOV  TH1,#0FAH

     MOV  SCON,#50H
     SETB TR1
     MOV  A,#'B'
     ACALL DELAY
A_1:
     MOV  SBUF,A
H_1: JNB  TI, H_1
     CLR  TI
     SJMP A_1
DELAY:

         MOV R0,#255
   L1:  DJNZ R0,L1
        MOV R1,#255
L2:     DJNZ R1,L2
        RET
        end

Parents
  • 0 in reply to Eric Best

    'Baud' [Bd] is a name of a unit named after Emile Baudot, 'rate' means a speed.

    Eric,

    Try using google and doing a define:baud

    Far more often than not, you'll get something along the lines of 'unit of signalling speed' and 'number of bits per second'.

    When I last got stopped by the police for speeding, they said I was doing 39MPH in a 30MPH zone, they didn't say I was doing 39MPH speed in a 30MPH speed zone.

    Change that to 'if I were to get stopped by the police' ;)

Reply
  • 0 in reply to Eric Best

    'Baud' [Bd] is a name of a unit named after Emile Baudot, 'rate' means a speed.

    Eric,

    Try using google and doing a define:baud

    Far more often than not, you'll get something along the lines of 'unit of signalling speed' and 'number of bits per second'.

    When I last got stopped by the police for speeding, they said I was doing 39MPH in a 30MPH zone, they didn't say I was doing 39MPH speed in a 30MPH speed zone.

    Change that to 'if I were to get stopped by the police' ;)

Children
  • 0 in reply to Susi Sware

    But at least the definitions claiming "number of bits per second" should be ignored since that is a very bad definition.

  • 0 in reply to Susi Sware

    I tried Google before I answered, of course. I must confess that even the 'unit named after Emile Baudot' has been pasted from Wikipedia (you may have noticed that ;-), even though I knew that fact before. On the other hand, Wikipedia (not talking about Google or Internet itself) is not fully trustworthy source...

    To Per Westermark:
    'baud rate' and 'number of bits per second' or, to be more precise, [Baud] and [bits/s] are DIFFERENT things, both meaningful. Unlike [Baud], which includes "all costs", i.e. START-bit, STOP-bit, parity bit, etc., the unit [bit/s] means only the 'useful' information (the character itself) transferred per second.

    Best regards,
    Eric

  • 0 in reply to Eric Best

    No, baud contra bits/s shouldn't consider bits including/excluding start/stop bits. It is the number of symbol transitions per second, so it might be the same as bits/s, but for example high-speed modems transfers more than one bit in each symbol by using phase and amplitude, i.e. bits/second is higher than your baud measure.

    That is why I claimed that definitions equalizing bits/s and baud are wrong.