8位数码管显示电子时钟c51单片机程序

/*
8位数码管显示  时间格式     05—50—00   标示05点50分00秒
S1 用于小时加1操作
S2 用于小时减1操作
S3 用于分钟加1操作
S4 用于分钟减1操作
*/

#include<reg52.h>
sbit KEY1=P3^0;        //定义端口参数
sbit KEY2=P3^1;
sbit KEY3=P3^2;
sbit KEY4=P3^3;
sbit LED=P1^2;        //定义指示灯参数

code unsigned char tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};        //共阴极数码管0—9
unsigned char StrTab[8];        //定义缓冲区
unsigned char minute=19,hour=23,second;        //定义并初始化为 12:30:00

void delay(unsigned int cnt)
{
        while(--cnt);
}

/******************************************************************/
/*                                显示处理函数                                      */
/******************************************************************/
void Displaypro(void)
{

        StrTab[0]=tab[hour/10];        //显示小时
        StrTab[1]=tab[hour%10];
        StrTab[2]=0x40;        //显示"-"
        StrTab[3]=tab[minute/10];        //显示分钟

        StrTab[4]=tab[minute%10];
        StrTab[5]=0x40;        //显示"-"
        StrTab[6]=tab[second/10];        //显示秒

        StrTab[7]=tab[second%10];
}

main()
{
        TMOD |=0x01;        //定时器0  10ms  inM  crystal  用于计时
        TH0=0xd8;           //初值
        TL0=0xf0;
        ET0=1;
        TR0=1;

        TMOD |=0x10;        //定时器1用于动态扫描
        TH1=0xF8;        //初值
        TL1=0xf0;
        ET1=1;
        TR1=1;
        EA =1;
        Displaypro();        //调用显示处理函数

        while(1)
        {
                if(!KEY1)        //按键1去抖以及动作
                {
                        delay(10000);
                        if(!KEY1)
                        {         
                                hour++;

                                if(hour==24)

                                        hour=0;        //正常时间 小时 加1
                                Displaypro();
                        }
                }

                if(!KEY2)        //按键2去抖以及动作
                {
                        delay(10000);
                        if(!KEY2)
                        {
                                hour--;

                                if(hour==255)

                                        hour=23;        //正常时间 小时减1
                                Displaypro();
                        }
                }
                if(!KEY3)        //按键去抖以及动作
                {
                        delay(10000);
                        if(!KEY3)
                        {
                                minute++;

                                if(minute==60)

                                        minute=0;        //分加1
                                Displaypro();
                        }
                }      
                if(!KEY4)        //按键去抖以及动作
                {
                        delay(10000);
                        if(!KEY4)
                        {
                                minute--;

                                if(minute==255)

                                        minute=59;        //分减1
                                Displaypro();
                        }
                }
        }
}

/******************************************************************/
/*                           定时器1中断                                   */
/******************************************************************/
void time1_isr(void) interrupt 3 using 0        //定时器1用来动态扫描
{
        static unsigned char num;
        TH1=0xF8;        //重入初值
        TL1=0xf0;

        switch (num)

        {
                case 0:P2=0;P0=StrTab[num];break;  //分别调用缓冲区的值进行扫描
                case 1:P2=1;P0=StrTab[num];break;
                case 2:P2=2;P0=StrTab[num];break;
                case 3:P2=3;P0=StrTab[num];break;
                case 4:P2=4;P0=StrTab[num];break;
                case 5:P2=5;P0=StrTab[num];break;
                case 6:P2=6;P0=StrTab[num];break;
                case 7:P2=7;P0=StrTab[num];break;
                default:break;
        }
        num++;        //扫描8次，使用8个数码管
        if(num==8)
                num=0;
}

/******************************************************************/
/*                              定时器0中断                                 */
/******************************************************************/
void tim(void) interrupt 1 using 1
{
        static unsigned char count;        //定义内部局部变量

        TH0=0xd8;        //重新赋值
        TL0=0xf0;
        count++;
        switch (count)
        {
                case 0:
                case 20:
                case 40:
                case 60:
                case 80:Displaypro();break;        //隔一定时间调用显示处理
                case 50:P1=~P1;break;        //半秒 LED 闪烁
                default:break;
        }

        if (count==100)
        {
                count=0;
                second++;        //秒加1
                if(second==60)
                {
                        second=0;
                        minute++;        //分加1
                        if(minute==60)
                        {
                                minute=0;
                                hour++;        //时加1
                                if(hour==24)
                                        hour=0;
                        } 
                }
        }
}