关于单片机LED二进制加法

void TIMED(unsigned int x );
main()
{
unsigned int clac = 0xff;
while(1)
{

P0 = clac;
clac--;
TIMED(300);

}
}

void TIMED( unsigned int x)
{
unsigned int y,i;
for(i = x; i > 0; i--)
for(y = 110; y > 0; y--);
}