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Jan 24, 2013 at 19:07 comment added Chris Stratton Regardless of a hardware or software UART, setting the baud rate at compile time is fine if 1) the device clock from which the baud rate is divided is sufficiently accurate and the division rounding error is within tolerance and 2) the connected equipment uses only the chosen baud rate, and uses it with sufficient accuracy.
Jan 24, 2013 at 18:12 comment added Farid-ur-Rahman The PIC16f84a doesn't have a built-in UART functionality. It I set baud rate at the time of programming, I think the timing errors may occur.
Jan 24, 2013 at 17:39 comment added Gustavo Litovsky Actually it is possible to "guess" the baudrate. Several implementations can do this in hardware where they find the baud rate without knowing it in advance.
Jan 24, 2013 at 17:29 history answered pjc50 CC BY-SA 3.0