单片机数字钟的设计
开机时，显示12：00：00的时间开始计时；P0.0用来较秒,P0.1用来较分,P0.2用来较时。 C语言原程序：

#include <AT89X52.H>
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
unsigned char dispbitcode[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned char dispbuf[8]={0,0,16,0,0,16,0,0};
unsigned char dispbitcnt;
unsigned char second;
unsigned char minite;
unsigned char hour;
unsigned int tcnt;
unsigned char mstcnt;   
unsigned char i,j;   
void main(void)
{
    TMOD=0x02;
    TH0=0x06;
    TL0=0x06;
    TR0=1;
    ET0=1;
    EA=1;   
    while(1) 更多精彩内容请点击http://www.elecfans.com/soft/33/2013/20130522318589.html下载观看~