It may be advantageous to use the high baud rate (BRGH = 1) even for slower baud clocks. Given the desired baud rate and FOSC, the nearest integer value for the SPBRG register can be calculated using the below formula. SPBRG is a 8-bit register which controls the baud rate generation. Both the devices Rx/Tx should be set to same baud rate for successful communication. The main criteria for UART communication is its baud rate. RX9D: 9th bit of Received Data (can be parity bit but must be calculated by user firmware) TX9D: 9th bit of Transmit Data, can be Parity bitġ = Serial port enabled (configures RC7/RX/DT and RC6/TX/CK pins as serial port pins)ġ = Enables address detection, enables interrupt and load of the receive buffer when RSR is setĠ = Disables address detection, all bytes are received and ninth bit can be used as parity bitġ = Framing error (can be updated by reading RCREG register and receive next valid byte)ġ = Overrun error (can be cleared by clearing bit CREN) Now lets see how to configure the individual registers for UART communication. Holds the data to to be transmitted on UART The below table shows the registers associated with PIC16F877A UART.
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