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What is the formula for computing UART transfer bit rate?

Latest Updated:04/12/2005

Question:

(Serial Interface)  What is the formula for computing UART transfer bit rate? [2005/04/12]

Answer:

  • When using the internal clock for the synchronous clock

    Main clock f(XIN) frequency range varies depending on the operating voltage.
     
  • When using external clock as synchronous clock
    Transfer bit rate ( bps ) = f ( SCLK ) / 16

    Please consider timing requirements regarding external clock frequency f(SCLK).
    A value which satisfies the minimum time specified in tc (SCLK) must be set.
    Refer to the electrical characteristics in the datasheet for timing requirements.

(#105191)

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