Arduino board rate Issue

Other Hardware 3rd Party Boards
1

Dear All I need to exchange data via UART ( Rx to Tx ) using arduino Uno with ATmega 328P which is tuning at 20MHz

Since both MCU running in different frequency so Please advice how should I set the board Rate

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spycatcher2k:
As long as the BAUD rates are both the same, it will work.

And as long as you compile the code for each board with the correct clock speed setting (I suggest using MCUDude/hansibul's MiniCore which has support for 20MHz ready to go)