#include <reg52.h>
sbit dx=P2^0;
sbit wx=P2^1;
unsigned int shi,ge,num=0;
unsigned char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
void delays(unsigned int xms)
{
unsigned int i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--)
;
}
void display(unsigned char shi,unsigned char ge)
{
wx=1;
P0=table[ge];
wx=0;
dx=1;
P3=0x02;
wx=0;
delays(5);
wx=1;
P0=table[shi];
wx=0;
dx=1;
P3=0x01;
dx=0;
delays(5);
}
void main()
{
unsigned temp;
temp=31;
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
while(1)
{
if(num==20)
{num=0;
temp--;
shi=temp/10;
ge=temp%10;
}
if(temp==0)
temp=31;
display(shi,ge);}
}
void time() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
num++;
}
求大神解释，
24 分钟前 仿真的时候数码管处于常亮状态，两个八，带小数点都亮，不会变化
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