51 single chip microcomputer makes a timer

We still use STC's 8051 microcontroller. This code is used to make a timer, which is displayed in real time through a digital tube. Because there are 6 digital tubes on the board, you can set the hours, minutes, and seconds. It can also be simulated on Proteus. When the timing ends, you can use a buzzer or a relay interface connection.

An alarm clock. An electromagnetic alarm clock will do. Of course, a buzzer is a good choice.

The program does not set the hour unit. Friends who want to add it can use the method of displaying minutes and seconds to display it. However, you should pay attention to the delay time after adding it. Improper time setting may cause unclear display, digital jitter, or unselected digital tubes to glow faintly ("ghosting"). You can debug the specific size yourself, which is also very simple. The following is the source code:

#include

#define uint unsigned int

#define uchar unsigned char

sbit we=P2^7;

bit du=P2^6;

uchar code table[]={0x3f,0x06,0x5B,0x4F,0x66,

               0x6D,0x7D,0x07,0x7F,0x6F,

               0x77,0x7C,0x39,0x5E,0x79, 

               0x71,0x76,0x38,0x37,0x3E,

               0x73,0x5C,0x40,0x00,};

uchar num=0,aa,s,g,m,f,h;

void delay(volatile x);

void main()

{    

    TMOD=0x01; //Set the internal interrupt 0, 1 to work in mode 1    

    EA=1; //Open the general interrupt

    ET0=1; //Enable interrupt    

    TR0=1; //Open interrupt 0          

    TH0=0x4c;

    TL0=0x00;

    while(1)

    {    

            du = 1;

            P0 = 0;

            du = 0;

            we = 1;

            P0 = 0x3e;

            we = 0;

            du = 1;

            P0 = table[s]; //ten digit

            du = 0;

            delay(10);

            du = 1;

            P0 = 0;

            du = 0;

            we = 1;

            P0 = 0x3d;

            we = 0;

            du = 1;

            P0 = table[g]; //unit

            du = 0;

            delay(10);

            du = 1;

            P0 = 0;

            du = 0;

            we = 1;

            P0 = 0x1f; //Display minutes

            we = 0;

            du = 1;

            P0 = table[m];

            du = 0;

            delay(10);

            du = 1;

            P0 = 0;

            du = 0;

            we = 1;

            P0 = 0x2f;

            we = 0;

            du = 1;

            P0 = table[h];       

            du = 0;

            delay(10);

        if(aa == 20)    

        {            

            aa = 0;

            if(num == 59)

            {

                num = 0;

                f++;

            }

            else

                num++;

            s = number/10;

            g = num%10;

            m = f%10;

            h = f/10;                

        }

        if(h == 6)

        f = 0;

    }

}

void timer0() interrupt 1 //Internal interrupt 0

{

    TH0=0x4c;

    TL0=0x00;

    aa++;

}

void delay(fly x)

{

    uchar y,z;

    for(y=x;y>0;y--)

        for(z=120;z>0;z--);

}