24.3.2.4.2 Receiver Error Flags

The USART receiver has three error flags in the Receiver Data Register High Byte register (USARTn.RXDATAH):

• Frame Error (FERR)
• Buffer Overflow (BUFOVF)
• Parity Error (PERR)

The error flags are located in the receive FIFO buffer together with their corresponding frame. Due to the buffering of the error flags, the USARTn.RXDATAH must be read before the USARTn.RXDATAL, since reading the USARTn.RXDATAL changes the FIFO buffer.