#include <reg51all.h>
#include <stdio.h>

void main(void)
{
	unsigned char c;
	int i;
	
	c = 0x01;
	
	while(1)
	{
		P1 = ~c;
		
		for(i=0;i<30000;i++);//延時
		
		c <<= 1;
		if( c == 0 ) c = 0x01;
	}
}