#include <reg51.h>
unsigned char x,y,si;

 unsigned char sin(unsigned char y)
 { si=(y/20*(0xff-y/42))>>8;
		 si=(y/6*(0xff-si))>>8;
     si=(x*(0xff-si))>>8;
	 return si;}
main()
{
 while(1)
  for(x=0; x<=0x0ff; x++)
   { y=(x*x)>>8;
	   sin(y);
	 }
  }