/*------------------------
实验功能：外部中断0，当P3^2有低电平进入外部中断0LED1被点亮
------------------------*/
#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit duan=P2^6;
sbit wei=P2^7;
sbit led1=P1^0;
uchar num;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay(uint);
void main()
{
EA=1;//开总中断
EX0=1;//外部中断0允许位
IT0=0;//电平触发
wei=1;
P0=0xc0;
wei=0;
while(1)
{
for(num=0;num<16;num++)
{
duan=1;
P0=table[num];
duan=0;
delay(500);//0.5s
}
}
}
void delay(uint a)
{
uint i,j;
for(i=a;i>0;i--)
for(j=110;j>0;j--);
}
void exter0() interrupt 0
{
led1=0;
}
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