基于8051实现的电子时钟(Version1.0)

本程序实现了基本的电子时钟功能, 初始时间为23:59:55.

#include <STC89C5xRC.H>

unsigned char code DIG_CODE[10] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f};//对应数码管显示0~9

int tcount = 0;//记录经过的2ms区间段个数

int hour = 23, minute = 59, second = 55;

void T0_INT() interrupt 1 //timer0中断, 每2ms触发一次

{

TR0 = 0;//关闭timer0

TH0 = 0xF8;

TL0 = 0x30;//65536 - 2000 = 63536 = F830H

if(tcount % 6 == 0)

{

//秒数个位

P2 = 0;//右数第一个数字亮

P0 = DIG_CODE[second % 10];

tcount ++;

}

else if(tcount % 6 == 1)

{

//秒数十位

P2 = 1 << 2;//右数第二个数字亮

P0 = DIG_CODE[second / 10];

tcount ++;

}

else if(tcount % 6 == 2)

{

//分钟个位

P2 = 2 << 2;

P0 = DIG_CODE[minute % 10];

tcount ++;

}

else if(tcount % 6 == 3)

{

//分钟十位

P2 = 3 << 2;

P0 = DIG_CODE[minute / 10];

tcount ++;

}

else if(tcount % 6 == 4)

{

//小时个位

P2 = 4 << 2;

P0 = DIG_CODE[hour % 10];

tcount ++;

}

else if(tcount % 6 == 5)

{

//小时十位

P2 = 5 << 2;

P0 = DIG_CODE[hour / 10];

tcount ++;

}

if(tcount == 500)//2ms * 500 = 1000ms = 1s -> 1s时间到

{

tcount = 0;

second ++;

if(second == 60)

{

second = 0;

minute ++;

if(minute == 60)

{

minute = 0;

hour ++;

if(hour == 24)

{

hour = 0;

}

}

}

}

TR0 = 1;//重新开启timer0

}

int main()

{

P2 = 111 << 2;

P0 = 0;//数码管全灭

TMOD = 0x01;

TH0 = 0xF8;

TL0 = 0x30;

IE = 0x82;

TR0 = 1;//开启timer0

while(1)

{

;

}

return 0;

}