此程序模拟普通的电子表的功能,实现了时,分,秒的显示,并有调表功能.程序简单,好多地方并没有注意细节,只是实现了部分功能.

/************************************************************************/

/* 程序：单片机模拟交通灯                                             

/* 日期：2008－5－11                                                                                             

/* 作者：河南大学 gys                                                                                         

/*    yongsheng.gys@163.com                                                                                 

/************************************************************************/

//数码管为8位七段共阳数码管,数据端接在P0口,选择端接P2口

//外部中断0,选择调时,分或秒,并闪烁,外部中断1,闪烁位加1,实现调表

//注:些程序只是模拟,并无精确校准

#include

unsigned char  LED7Code[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,

                                                 0x80,0x90,0x88,0x83,0x0c6,0xa1,0x86,0x8e,

                                                               0xbf,              //'-'

                                                 }; //七段共阳数码管的编码0-f

unsigned char LED7Addr[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; //数码管的地址

unsigned char flag=0;

unsigned char loop=0;

unsigned char second=0;

unsigned char minute=0;

unsigned char hour=0;

void delay(unsigned int n)         //n=10000,延时90.05毫秒

{

       while(n--);

}

void display(unsigned char addr,unsigned char LEDCode)    //通用显示函数

{

       P2=LED7Addr[addr];          //P2送数码管的地址

       P0=LED7Code[LEDCode];  //P0送要显示的数据

       delay(500);                         //延时

}

void INT_EX0() interrupt 0

{

       delay(2000);

       if (!P3_2)

       {

              if(flag++>=3) flag=0;

       }

}

void INT_EX1() interrupt 2

{

       delay(2000);

       if (!P3_3)

       {

              if(flag==1) second++;

              if(flag==2) minute++;

              if(flag==3) hour++;

       }

}

void INT_T0() interrupt 1   //定时器0

{

       TL0=0xb0;     //装入初值，15536，定时50000us

       TH0=0x3c;

       loop++;

}

void main()

{

       TMOD=0x01; //定时器0，工作方式2,16位定时器

       TL0=0xb0;     //装入初值，15536，定时50000us

       TH0=0x3c;    

       ET0=1;

       TR0=1;

       EX0=1;

       EX1=1;

       IT0=1;    //跳变方式

       IT1=1;

       EA=1;

       while (1)

       {

              if(loop>=20)

              {

                     second++;

                     loop=0;

              }

              if (second>=60)

              {

                     second=0;

                     minute++;

              }

              if (minute==60)

              {

                     minute=0;

                     hour++;

              }

              if (!(flag==3&&loop<10))

              {

                     display(0,hour/10);

                     display(1,hour%10);

              }

              display(2,16);

              if (!(flag==2&&loop<10))

              {

                     display(3,minute/10);

                     display(4,minute%10);

              }

              display(5,16);

              if (!(flag==1&&loop<10))

              {

                     display(6,second/10);

                     display(7,second%10);

              }

       }

}