#include  	
int main (void) {
  volatile unsigned long i;
  IODIR0 = 0xFFFF0000;

   while (1) {

  for (i = 0; i < 0x100000; i++)  {
    ;
                     };

  IOSET0 = 0xFFFF0000;
    
	for (i = 0; i < 0x100000; i++)  {
         ;
                      };

  IOCLR0 = 0xFFFF0000;
  
	        }
}