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UART framing errors

A UART link shows frequent framing errors at 921600 baud but works at 9600. The MCU runs from its internal RC oscillator. What is the most likely cause?

A.The TX and RX wires are swappedB.The internal oscillator is not accurate enough, so the baud rate drifts from the other sideC.The UART FIFO is too largeD.Parity is enabled on both sides

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UART framing errors

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