原理图
#include <reg52.h>
#define uint unsigned int // 宏
#define uchar unsigned char
sbit a = P1^0;
sbit b = P1^1;
sbit c = P1^2;
sbit d = P1^3;
uchar code table[]=
{0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
void delayms(uint);
void display(uint);
uint num=0;
uchar shi=0;
void display(uint num)
{
d=1;
P0=table[num%10];
delayms(5);
P0=0XFF;
d=0;
c=1;
P0=table[(num/10)%10];
delayms(5);
P0=0XFF;
c=0;
}
void jishu() interrupt 1
{
if(shi==10)
{
shi=0;
num++;
}
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
shi++;
}
void delayms(uint xms)
{
uint i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}
void main()
{
TMOD=0X01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
while(1)
{
a=0;
b=0;
display(num);
}
}