51单片机数码管电子时钟C语言代码

以下是一个简单的基于51单片机的数码管电子时钟C语言代码示例：

#include <reg51.h>

#define uchar unsigned char
#define uint unsigned int

uchar code table[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

uchar second = 0, minute = 0, hour = 0;

void delay(uint xms)
{
    uint i, j;
    for(i = xms; i > 0; i--)
        for(j = 110; j > 0; j--);
}

void display(uchar num, uchar pos)
{
    uchar i;
    uchar temp = 0;
    temp = num % 10;
    P0 = 0x00;
    P2 = 0x01 << pos;
    P0 = table[temp];
    delay(1);
    temp = num / 10;
    P0 = 0x00;
    P2 = 0x01 << (pos + 1);
    P0 = table[temp];
    delay(1);
}

void timer0() interrupt 1
{
    TH0 = (65536 - 50000) / 256;
    TL0 = (65536 - 50000) % 256;
    second++;
    if (second == 60)
    {
        second = 0;
        minute++;
        if (minute == 60)
        {
            minute = 0;
            hour++;
            if (hour == 24)
            {
                hour = 0;
            }
        }
    }
}

void main()
{
    TMOD = 0x01;
    TH0 = (65536 - 50000) / 256;
    TL0 = (65536 - 50000) % 256;
    EA = 1;
    ET0 = 1;
    TR0 = 1;
    while(1)
    {
        display(hour, 0);
        display(minute, 2);
        display(second, 4);
    }
}

这个代码采用了定时器中断的方式来实现时间的计数和更新，然后利用函数 `display()` 将当前时间显示在数码管上。需要注意的是，代码中的数码管显示方式可能需要根据使用的具体硬件进行调整。