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

main()
{
	while(1)
		for(x = 0; x <= 0xff; x++)
		{
			y=(x*x)>>8;
			cos=( y/12 * (1-y/30)) >> 8;
			cos= ( y/2 * (0-cos)) >> 8;
			P3= cos = (1-cos) >> 8;
	 	}
  }