C51用定时器0做八位时钟原理图和代码

 1 #include<reg52.h>
 2 #define uchar unsigned char
 3 #define uint unsigned int
 4     uint i;
 5    uint h=0,m=0,f=0,t4ms=0;
 6 void init()
 7 {
 8     TMOD = 0x01;
 9     TH0 = (65535-50000)/256;
10     TL0 = (65535-50000)%256;
11       ET0 = 1;
12     EA = 1;
13     TR0 = 1;
14 }
15 void delay(uint j){
16     while(j--);
17 }
18 uchar  duan[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
19 uint  wei[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
20 void main()
21 {
22    init();
23    while(1)
24    {
25        for(i=0;i<8;i++)
26        {
27              P1=wei[i];
28           switch(i)
29           {
30             case 0:P2=duan[h/10];break;
31               case 1:P2=duan[h%10];break;
32               case 2:P2=0x40;break;
33             case 3:P2=duan[f/10];break;
34               case 4:P2=duan[f%10];break;
35               case 5:P2=0x40;break;
36               case 6:P2=duan[m/10];break;
37               case 7:P2=duan[m%10];break;
38               default:break;
39           }
40             delay(30);
41         }
42     }      
43 }
44 void ljj() interrupt 1
45 {
46        t4ms++;
47           if(t4ms==13)
48           {
49              t4ms=0;
50                m++;
51              if(m==60)
52              {
53                m=0;
54                f++;
55                if(f==60)
56                {
57                   f=0;
58                   h++;
59                   if(h==12)
60                   {
61                      h=0;
62                   }
63                }
64              }
65           }
66     
67 }
68