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How to make the serial port baud rate not change with temperature?

How to select nrf528332 UART clock source, how to make the serial port baud rate not change with temperature?When the baud rate is 9,600, the baud rate varies greatly with the temperature.Baud rate when - 25 ℃ maximum deviation to -3.5%, when to 55 ℃ baud rate deviation of 2.1%.

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