#include <reg51.h>
sfr SBUF1=0xC1;
sfr SCON1=0xC0;
sbit TI1=0xC1;
void main(void)
  {
    TMOD=0x20;		  
    TH1=0xFA;		  
    SCON1=0x50;		  
    TR1=1;			  
    while(1)
      {
        SBUF1='A'; 	  
        while(TI1==0); 
        TI1=0;
      }
  }