#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
uchar aa,bb,ge,shi,bai;
uchar code shuzi[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void time(uchar k)
{
uchar x,y;
for(x=100;x>0;x--)
for(y=k;y>0;y--);
}
void dsq0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
aa++;
if(aa==20)
{
aa=0;
bb++;
if(bb==100)
{
bb=0;
}
bai=bb/10;
shi=bb%10/10;
ge=bb%10;
}
}
void init()
{
P0=0;
P2=1;
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
IT0=1;
}
void display( bai,shi,ge)
{
P0=shuzi[bai];
P2=0xfd;
time(5);
P0=0x00;
P2=0x00;
P0=shuzi[shi];
P2=0xfe;
time(5);
P0=0x00;
P2=0x00;
P0=shuzi[ge];
P2=0xfb;
time(5);
P0=0x00;
P2=0x00;
}
void main()
{
init();
while(1)
{
display(bai,shi,ge);
}
}
用定时器1的方式实现数码管前三位以99s循环计时——1秒加一次
易错点:1,注意位选与段选的阳/阴极接法
2,注意显示函数display是否写错电路功能是否明确
3,求余运算和求模运算写好后位置是否放对?程序是否执行得到那一位?
设计者:薛羽豪
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