Asynchronous Reception Setup
- 1.Initialize the SPxBRGH:SPxBRGL
register pair and the BRGH and BRG16 bits to achieve the desired baud rate (see EUSART Baud Rate Generator (BRG)).
- 2.Set the RXxPPS register to select the RXx/DTx input pin.
- 3.Clear the ANSEL bit for the RXx pin (if applicable).
- 4.Enable the serial port by setting the SPEN bit. The SYNC bit must be cleared for asynchronous operation.
- 5.If interrupts are desired, set the RCxIE bit of the PIEx
register and the GIE and PEIE bits of the INTCON register.
- 6.If 9-bit reception is desired, set the RX9
bit.
- 7.Enable reception by setting the CREN bit.
- 8.The RCxIF Interrupt Flag bit will be set when a character is
transferred from the RSR to the receive buffer. An interrupt will be generated if the
RCxIE interrupt enable bit was also set.
- 9.Read the RCxSTA register to get the Error flags and, if 9-bit data
reception is enabled, the ninth data bit.
- 10.Get the received eight Least Significant data bits from the
receive buffer by reading the RCxREG register.
- 11.If an overrun occurred, clear the OERR flag by clearing the CREN receiver enable bit.