#include<reg52.h>
#include<absacc.h>

#define unit unsigned int 
#define uchar unsigned char

sbit L0=P2^0;
sbit L1=P2^1;
sbit L2=P2^2;
sbit L3=P2^3;

void delays()
{
	uchar i;
	for(i=300;i>0;i--);
}

void main()
{
	P2=0xff;
	EA=1;
	IT0=1;
	EX0=1;
	while(1)
	{
		delays();
	}
}

void intersvr0(void) interrupt 0 using 1
{
	L3=!L3;

	L2=!L2;

	L1=!L1;

	L0=!L0;
}