[SOLVED] [Moved] UART serial communication in 89c52

#include <reg51.h>
sbit WAVE =P0^1;
void timer0() interrupt 1
 {
         WAVE=~WAVE; //toggle pin
}
void serial0() interrupt 4
 {
      if (TI==1) 
      {
                 TI=0; //clear interrupt
       }
      else 
      {
               P0=SBUF; //put value on pins
              RI=0; //clear interrupt
        }
}
void main()
 {
           unsigned char x;
           P1=0xFF; //make P1 an input
           TMOD=0x22;
            TH1=0xF6; //4800 baud rate
            SCON=0x50;
            TH0=0xA4; //5 kHz has T=200us
            IE=0x92; //enable interrupts
            TR1=1; //start timer 1
            TR0=1; //start timer 0
             while (1)
            {
                        x=P1; //read value from pins
                        SBUF=x; //put value in buffer
                         P2=x; //write value to pins
            }
}