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Hi I am trying to use UARTS on my board which has a STR91XFAW_128 MCU.However on trying to simply send data from the board to hyperterminal I am not getting the correct data.If anybody has sample code for the same can they please post a link to it.Also does the baudrate used dictate the performance of the UARTS.
Yes, it's the same thing with the PC as with the microcontroller. The baudrate generator have a fixed-frequency clock that gets divided to produce the requested baudrate (or normally 16 times the expected baudrate because of oversampling).
At higher baudrates, it's important to compute or measure what the actual baudrate will be. Too much off because of rounding errors, and the transfer will not be reliable anymore.
It's easier when two identical producs are communicating, since then the baudrate will be similarly off on both ends.