Understanding why framing error (EUSART) | Microchip
2015-3-8 · A 'framing error' means that the USART saw a low when it was expecting a high (in the middle of the STOP bit pulse). This means one of: [1] Your baud rate at sender and receiver are very different, so the receiver (i.e. the PIC) is sampling each bit earlier and earlier, so it sometimes sees the end of the 8th bit instead of the middle of the stop bit. [2]
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