【PROTEUS仿真】AT89C51實現24H時鐘功能

原理圖及運行效果

源代碼

#include "reg51.h"

#define TT	50000		//time=20*TT/1000    50000=1s

unsigned char code seg[]= {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40,0x00};

void disp(char h,char m,char s);

char hour=11,minute=59,second=0,MODE=24,PM_FLAG=0,flash;

unsigned char t_50ms=0;	//50ms計數器

sbit H_key=P0^0;
sbit M_key=P0^1;
sbit RST_key=P0^2;
sbit MODE_key=P0^3;

delay(int t)
{
    while(t--);
}

void timer_1() interrupt 3
{
    TH1=(65536-TT)/256;
    TL1=(65536-TT)%256;
    t_50ms++;
    if(t_50ms==20)
    {
        t_50ms=0;
        second++;
        //minute++;
    }
    if(t_50ms<10) flash=0;
    else flash=1;
}

void process_key(void)
{

    if(H_key==0)
    {
        hour++;
        while(H_key==0);	//等待按鍵鬆開
    }
    if(M_key==0)
    {
        minute++;
        while(M_key==0);	//等待按鍵鬆開
    }
    if(RST_key==0)
    {
        hour=0;
        minute=0;
        second=0;
        PM_FLAG=0;

        while(RST_key==0);	//等待按鍵鬆開
    }
    if(MODE_key==0)
    {
        if(MODE==24)
        {
            MODE=12;
            if(hour>=12)
            {
                hour-=12;
                PM_FLAG=1;
            }
        }
        else
        {
            MODE=24;
            hour=12*PM_FLAG+hour;
        }
        while(MODE_key==0);	//等待按鍵鬆開
    }
}

int main()
{
    TMOD=0X10;
    TH1=(65536-TT)/256;	//reload TH1
    TL1=(65536-TT)%256; //reload TL1
    ET1=1;		//enable T1 interrupt
    EA=1;		//enable interrupt
    TR1=1;		//start T1 counter


    while(1)
    {
        disp(hour,minute,second);	//顯示
        process_key();				//處理按鍵
        if(second==60)
        {
            minute++;
            second=0;
        }
        if(minute==60)
        {
            hour++;
            minute=0;
        }
        if(hour==MODE)
        {
            hour=0;
            if(MODE==12)
            {
                if(PM_FLAG==1) PM_FLAG=0;
                else PM_FLAG=1;
            }
        }

        if(MODE==24 && hour >=12)
        {
            PM_FLAG=1;
        }
    }
}

void disp(char h,char m,char s)
{
    char n=0;
    P1=0XFF;
    P1=~seg[h/10%10];
    P2=~(0x01<<n);
    n++;
    delay(100);

    P1=0XFF;
    P1=~seg[h%10];
    P2=~(0x01<<n);
    n++;
    delay(100);

    P1=0XFF;
    P1=~seg[16+flash];
    P2=~(0x01<<n);
    n++;
    delay(100);

    P1=0XFF;
    P1=~seg[m/10%10];
    P2=~(0x01<<n);
    n++;
    delay(100);

    P1=0XFF;
    P1=~seg[m%10];
    P2=~(0x01<<n);
    n++;
    delay(100);

    P1=0XFF;
    P1=~seg[16+flash];
    P2=~(0x01<<n);
    n++;
    delay(100);

    P1=0XFF;
    P1=~seg[s/10%10];
    P2=~(0x01<<n);
    n++;
    delay(100);

    P1=0XFF;
    P1=~seg[s%10];
    P2=~(0x01<<n);
    n++;
    delay(100);


}