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You are here: Home / Topics / serial control register of AT89C51

serial control register of AT89C51

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Microcontroller › 8051 › serial control register of AT89C51

  • This topic has 1 reply, 1 voice, and was last updated 14 years, 9 months ago by Anonymous.
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  • August 29, 2010 at 3:28 pm #397
    Anonymous
    Guest

    In serial control register of at89c51 the last two bits (SM0,SM1)determine the framing of data. In mode 1(SM0=0& SM1=1)data is framed as 1 start bit , 1 stop bit and 8 bit data.How the data is configured in other three modes.

    August 31, 2010 at 7:26 am #5029
    Anonymous
    Guest

    see if it helps:

    SM0        SM1        Mode                      Explanation                          Baud rate

    0              0              0                              8 bit shift register                 Oscillator/12

    0              1              1                              8 bit UART                             Set by Timer1

    1              0              2                              9 bit UART                             Oscillator/32

    1              1              3                              9 bit UART                             Set by Timer1

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