PIC16F877A-HITECH C – UART

Transmission

#include<pic.h>
#define _XTAL_FREQ 16000000
void main() {
    SPEN=1; //enables serial port
    SYNC=0; //setting in asynchronous mode
    BRGH=0; //selects low speed baud rate
    SPBRG=25; //setting baud rate @ 9600
    TXEN=1; //enables transmission
    TX9=0; //sets transmission in 8-bit mode
    while(1) {
        if(TRMT==1) //check status of transmit shift register status for empty
        {
            TXREG='A'; // writes ascii value of letter A
        }
    }
}

Reception

Note– i have used PORTB to see incoming ascii value

#include<pic.h>
#define _XTAL_FREQ 16000000
void main()
{
    SPEN=1; //enables serial port
    SYNC=0; //setting in asynchronous mode
    BRGH=0; //selects low speed baud rate
    SPBRG=25; //setting baud rate @ 9600
    CREN=1; //enables reception
    RX9=0; //sets reception in 8-bit mode
    TRISB=0;
    PORTB=0;
    while(1)
    {
        PORTB=(RCREG-0x30); // writes ascii value of letter A
    }
}

see software UART at http://jimmyjosep.blogspot.in/2013/11/under-standing-uartsoft.html