目标:外部中断0实现led闪烁

#include<reg52.h>

typedef unsigned int u16;
typedef unsigned char u8;

sbit k3 = P3^2; //独立按键，连接外部中断0
sbit led = P2^0;

void delay(u16 i)
{
    while(i--);
}

void Int0_init() //提前把外部中断0的参数准备好
{
    EA = 1;
    IT0 = 1;
    EX0 = 1;
}


void main()
{
    Int0_init();
    while(1);
}

void INT0() interrupt 0
{
    delay(1000);
    if(k3==0){  //按键按下
        led = ~led; //led取反
    }
}