Serial Communication

/************************
Serial Communication

Monitor the serial console
Baud Rate: 9600bit/s
*************************/
#include <reg52.h>

void UsartConfiguration()
{
    SCON = 0x50; // Set mode to 1
    TMOD = 0x20; // Set timer mode to 2
    PCON = 0x00; // SMOD = 0
    TH1 = 0xfd;  // init counter
    TL1 = 0xfd;
    ES = 1;  // open receiver interrupt
    EA = 1;  // open general interrupt
    TR1 = 1; // open counter
}

void main()
{
    UsartConfiguration();
    while (1);
}

void uart() interrupt 4
{
    unsigned char date;
    date = SBUF; // take received data
    RI = 0;      // clean receiver interrupt mark
    SBUF = date; // put received data to buffer register
    while (!TI);   // waiting sending data complete
    TI = 0; // clear send interrupt mark
}