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how to calculate usart "Error calculation" - desired baud rate != actual baud rate

Question asked by John Doe on Dec 30, 2017
Latest reply on Dec 31, 2017 by Clive One

Hello all,

I have no idea how to calculate usart "% error calculation" for stm32f429. There is difference between actual baud rate and desired baud rate. Why actual baud rate != desired baud rate?

 

I try to calculate usart % of error for 90mhz. The last calculation in documentation is for 84mhz (see attach).

thanks in advance

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