#include <reg51.h>
sbit d1=P1^0;
void main(void)
{

 PCON=0xFF;                     //to set PCON.7 for baud rate
 TMOD=0x20;                     //timer 1 mode 2
 TH1=0xFA;                      //for baud rate 9600
 SCON=0x50;
 TR1=1;                         //start timer 1
 if(d1==1)
    {SBUF='Y';                  //sends Y
     while(TI==0);
     TI=0;
    }

 else
     {SBUF='N';                 //sends N
     while(TI==0);
     TI=0;
     }
 SBUF=0x0D;                     //sends carriage return and line feed
 while(TI==0);
 TI=0;
 SBUF=0x0A;
 while(TI==0);
 TI=0;

}