1 /* Main.c file generated by New Project wizard 2  * 3  * Created:   周一 六月 5 2017 4  * Processor: 80C51 5  * Compiler:  Keil for 8051 6  */ 7  8 #include 
     
       9 #include 
      
       10      //定义共阴数码管断码  0    1    2    3    4     5   6     7    8    9   A    B    C     D   E    F11 unsigned char duan[]= {
   0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};12 unsigned char wei[]={
   0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};//定义共阴数码管位码13 unsigned char t50ms = 0,sec =0, min = 0,hour = 0;//定义50ms,秒，分、时的变量14 unsigned char j;//定义循环变量15 //延时函数16 void delay(unsigned int i)17 {18    while(i--);19 }20 //定时器0的初始化21 void init(){22    TMOD = 0X01;//选择工作方式1，16位寄存器存储初值23    ET0 = 1;//打开定时器0的分开关24    TH0 = (65535-50000)/256;//给定时器0高八位赋初值25    TH0 = (65535-50000)%256;//给定时器0低八位赋初值26    TR0 = 1;//启动定时器027    EA = 1;//打开总闸28 }29 //主函数30 void main(void)31  { 32     init();//调用初始化函数33    while(1)//死循环34       {35         for(j=0;j<8;j++)36     {37        P1 = wei[j];//给P1端口送位码38        switch(j)//分别给八位数码管赋相应的值39        {40           case 0:P2=duan[hour/10];break;//hour/10：取到小时的十位41           case 1:P2=duan[hour%10];break;//hour%10：取到小时的个位42               case 2:P2=0X40;break;//显示小时和分钟之间的-（横杠）43           case 3:P2=duan[min/10];break;44           case 4:P2=duan[min%10];break;45               case 5:P2=0X40;break;46           case 6:P2=duan[sec/10];break;47           case 7:P2=duan[sec%10];break;48               default:break;49        }50        delay(500);//小延时51     }52       }53  }54  //中断服务子函数55  void dingshi() interrupt 1{56     t50ms++;//50ms累加57     if(t50ms == 20)//加到20次，即1s58     {59        sec++;//秒就累加60        t50ms = 0;//50ms清零61        if(sec == 60)//秒钟为60s62        {63       min++;//分钟就累加64       sec = 0;//秒清零65       if(min ==60)//分钟为60m66       {67          hour++;//小时就累加68          min = 0;//分钟清零69          if(hour ==24)//hour为24小时70       {71          hour = 0;//hour清零72       }73       }74        }75     }76  }