//“驗(yàn)證式”	實(shí)驗(yàn)十五  INT0中斷實(shí)驗(yàn)
#include "reg51.h"
void DELAY();
void int0() interrupt 0 using 0
    {
       EA=0;
       P1=P1|0x04;
       DELAY();
       P1=P1&0xfb;
       DELAY();
       EA=1;
    }

void main()
    {
       while(1){
            if(P1&0x08)
                TCON=TCON|0x01;
            else
                TCON=TCON&0xfe;

       IE=IE|0x81;
       IP=IP|0x02;
               }
    }

void DELAY(void)
    {
       unsigned char i=50,j;
          while(i--)
       {j=255;
          while(j--);

    }
}