#include<reg51.h>
			#include<stdio.h>
			#define    uchar     unsigned   char
			#define    uint      unsigned   int


			sbit    DDD=P1^0;
			uchar     count1;
			uint    temp;
			main()
			{
				SCON=0X40;
				TMOD=0X21;
				TR1=1;
				ET1=0;
				TH1=0XFD;
				TL1=0XFD;
				TH0=0X00;
				TL0=0X00;
				TR0=0;
				ET0=1;
				EX0=1;
				IT0=1;
				EA=1;
				while(1);	
				
				
			}
			void    EINT0(void)	  interrupt	  0   using   1
			{
				 TR0=1;
				
				 if(/*(TH0>0X02)&&(TH0<0X04)*/TH0==0X03)
						{
						temp=(temp<<1)+0;
						count1++;
						}
				 if(/*(TH0>0X06)&&(TH0<0X08)*/TH0==0X07)
						{
						temp=(temp<<1)+1;	
				 		count1++;
						}
				 TH0=TL0=0X00;
				 if(count1==16)
					{
					 if(((temp&0xff00)>>8)==0xe2)
					 	  {
							 SBUF=(temp&0xff);
							 while(!TI);
							 TI=0;
							 SBUF=((temp&0xff00)>>8);
							 while(!TI);
							 TI=0;
							 temp=0x0000;
							 count1=0;
					 	   }
					  else
					  		{
							 temp=0x0000;
							 count1=0;
							}
					  	
					 }
			
			}
			void    time_0(void)   interrupt  1   using   2
			{
				TR0=0;
				TH0=TL0=0X00;
				count1=0;
			}