我们学单片机，一般都会写数字时钟编程。它能帮助我们：
a． 能够系统性地总结掌握的知识，将单元模块知识有机的结合在一起。
b． 能够充分协调好硬件与软件之间的相互结合，合理设计硬件电路。
c． 掌握单片机 C 语言判断语句、分支语句以及子程序调用等编程知识。
我们学单片机都要做实物与仿真。接下来我先简单讲一下数字时钟在仿真中的作用。
仿真中我写了简单的选位调时、分、秒，根据我选的时、分、秒。进行加减。
也可以在实物打板中，实现数字时钟。
这是小编做的简易51单片机板，而且这种10x10以下规格的打板是不用花费钱的。感兴趣的读者可以打板玩玩。想知道怎么打板的读者留言告诉小编，小编出一个打板教程。
接下来小编的代码有需要的读者自取。
#include<reg52.h>
sbit key1 = P3^0;//换位
sbit key2 = P3^1;//加
sbit key3 = P3^2;//减sbit LED = P1^7;
unsigned char kz1,kz2,kz3,kz4,kz5,w,k,nz,h;
unsigned char ss = 2, sg = 3, fs = 5, fg = 9, ms = 5, mg = 5;//char SMG[18] = {0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xF6,0xEE,0x3E,0x9C,0x7A,0x9E,0x8E,0x00,0X02} ;//实物
char SMG[12] = {
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40,0x00} ;//仿真
char are[] = {0Xfe,0Xfd,0Xfb,0Xf7,0Xef,0Xdf,0Xbf,0X7f};void zhongduan();
void keykongzhi();
void naoshizhong();
void LedDriver();void delay(unsigned int i){while(i--);}void main(){zhongduan(); while(1){naoshizhong();keykongzhi();LedDriver();}}void naoshizhong(){P0 = SMG[ss];P2 = are[0]; delay(500); P2 = 0Xff;P0 = SMG[sg];P2 = are[1]; delay(500); P2 = 0Xff; P0 = SMG[10];P2 = are[2]; delay(500); P2 = 0Xff;P0 = SMG[fs];P2 = are[3]; delay(500); P2 = 0Xff;P0 = SMG[fg];P2 = are[4]; delay(500); P2 = 0Xff;P0 = SMG[10];P2 = are[5]; delay(500); P2 = 0Xff;P0 = SMG[ms];P2 = are[6]; delay(500); P2 = 0Xff;P0 = SMG[mg];P2 = are[7]; delay(500); P2 = 0Xff;}void keykongzhi(){if(key1 == 0 && kz1 == 0){kz1 = 1;}else if(key1 == 1 && kz1 == 1){kz1 = 0;w++;w &= 0x03;} if(key2 == 0 && kz2 == 0){kz2 = 1;}else if(key2 == 1 && kz2 == 1){kz2 = 0;switch(w){ case 1: mg = 0; ms = 0; break;case 2: fg ++; break;case 3: sg ++; break; }}if(key3 == 0 && kz3 == 0){kz3 = 1;}else if(key3 == 1 && kz3 == 1){kz3 = 0;switch(w){ case 1: mg = 0; ms = 0; break;case 2: fg --; break;case 3: sg --; break; }}if(w == 1 && nz == 0) //时钟调秒{P0 = SMG[ms]+128;P2 = are[6]; delay(800); P2 = 0Xff;P0 = SMG[mg]+128;P2 = are[7]; delay(800); P2 = 0Xff;}if(w == 2 && nz == 0) //时钟调分{P0 = SMG[fs]+128;P2 = are[3]; delay(800); P2 = 0Xff;P0 = SMG[fg]+128;P2 = are[4]; delay(800); P2 = 0Xff;}if(w == 3 && nz == 0) //时钟调时{P0 = SMG[ss]+128;P2 = are[0]; delay(800); P2 = 0Xff;P0 = SMG[sg]+128;P2 = are[1]; delay(800); P2 = 0Xff;}}void zhongduan(){TMOD=0X01;TH0=0X3C;//50msTL0=0XB0;ET0=1;TR0=1;EA=1;}void LedDriver(){if (k >= 40){k = 0;mg ++;}if (mg >= 10){mg = 0;ms ++;}if (ms >= 6){ms = 0;fg ++;}if (fg >= 10){ fg = 0;fs ++;}if (fs >= 6){fs = 0;sg ++;} if (sg >= 10){sg = 0;ss ++ ;} if (ss ==2 && sg == 4){ ss = 0;sg = 0;} }void time0() interrupt 1 using 0{TH0=0X3C;TL0=0XB0;k ++; }
