#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
/*sbit PD=PCON^1;	*/
sbit keyhx=P1^0;
sbit d1=P0^1;

uchar num;
void delay(uint z)	
{
	uint x,y;
	for(x=z;x>0;x--)
	for(y=110;y>0;y--);

}
void init()
{	
	EA=1;
	EX0=1;
	IT0=1;
	TCON=0x01;
}
void exter0() interrupt	0
{
   EA=0;
   d1=1;
   PCON&=0x02;
   EA=1;
}
void main()
{   init();
	P3=0xff;  
	P1=0xff;
	while(1)
	{	
		if(keyhx==0)
        {	
       		delay(10);
 			if(keyhx==0)
				{	 
			        d1=0;
					PCON|=0x02;
					
					num++;
					if(num==10)
						{
					           num==0;
						}
				}
			while(!keyhx);
 			delay(10);
			while(!keyhx);
        }

	}

}