这程序我下载进去，进去蜂鸣器就响了,按理说应该 p3.2是0的时候触发了中断才响的
#include <reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit d0=P2^2;
sbit d2=P2^6;
sbit D3=P2^7;
uchar temp,num;
uchar code table[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfc,0x87,0xff,0xe7,0xf7,0xfc,0xb9,0xde,0xf9,0xf1};
void delay(uint z);
void main()
{
EA=0x01;
EX0=1;
IT0=1;
D3=1;
P0=0X00;
D3=0;
while(1)
for(num=0;num<16;num++)
{
d2=1;
P0=table[num];
d2=0;
delay(50000);
}
}
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--);
for(y=10000;y>0;y--);
}
void exter0() interrupt 0
{
d0=0;
}
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