51 MCU digital clock simulation (LCD1602 liquid crystal display) + source program + circuit schematic diagram

The following is the 51 single-chip digital clock program:

#include

#define DSbus P0

#define LCDbus P1

//Define the control lines of DS12C887 and LCD

sbit DS_CS = P2^7; //Pin 13, chip select signal input, low level is valid.

sbit DS_AS = P2^4; //Pin 14, address select input.

sbit DS_RW = P2^5; //Pin 15, read/write input.

sbit DS_DS = P2^6; //Pin 17, data select or read input.

sbit LCD_RS=P2^0;

sbit LCD_EN=P2^2;

//Time variable definition

unsigned char Counter;

unsigned char Hour,Min,Sec,Year,Month,Date,Week;

/*DS12CR887 driver--------------------------------------------------------------------------*/

//Function to write data to DS12CR887

void DS12887write(unsigned char add,unsigned char Date)         

{

        DS_CS=0;

  DS_DS=1;

        DS_RW=1;

  DS_AS=1;

        DSbus=add;

        DS_AS=0;

  DS_RW=0;

        DSbus=Date;

        DS_RW=1;

  DS_AS=1;

        DS_CS=1;

}

//Read DS12CR887 data function

unsigned char DS12887read(unsigned char add)

{

        unsigned char z;

        DS_CS=0;

  DS_RW=1;

        DS_DS=1;

  DS_AS=1;

        DSbus=add;

        DS_AS=0;

  DS_DS=0;

  DSbus=0xff;

        z=DSbus;

        DS_DS=1;

  DS_AS=1;

        DS_CS=1;

        return z;

}

//DS12CR887 initialization function

void DS12887LCDinit()

{

        DS_AS=0; DS_DS=0; DS_RW=0;

        DS12887write(0x0a,0x20); //DS12CR887 register A function setting, turn on the clock oscillator

        DS12887write(0x0b,0x06); //Register B function setting, alarm interrupt enable is not enabled, data mode is binary, 24-hour mode.

        //DS12887write(4,0x8);DS12887write(2,0x00);DS12887write(0,0x00); //Assign the hours, minutes, and seconds to DS12CR887, and it will display 8:00:00 after booting

}

void Delay(unsigned int z)

{

        unsigned int x,y;

   for(x=z;x>0;x--)

         for(y=110;y>0;y--);

}

void LCDwritecom(unsigned char com)

{

        LCD_RS=0;

        LCDbus=com;

        Delay(5);

        LCD_EN=1;

        Delay(5);

        LCD_EN=0;

}

void LCDwritecomdata(unsigned char dat)

{

        LCD_RS=1;

        LCDbus=dat;

        Delay(5);

        LCD_EN=1;

        Delay(5);

        LCD_EN=0;

}

void LCDinit()

{

        LCD_EN=0;

        LCDwritecom(0x38);

        LCDwritecom(0x0c);

        LCDwritecom(0x06);

        LCDwritecom(0x01);

        LCDwritecom(0x80);

}

void Timedisplay(void)

{

        //LCDwritecom(1);

        LCDwritecom(0x80);

//Fill in the "hour" data on the LCD screen-----------------------------------------------

        Hour=DS12887read(4); //Read the hour data of DS12CR887

        if((Hour/10)==0)LCDwritecomdata(0);

                else LCDwritecomdata(Hour/10+0x30); //Tens of hours

        LCDwritecomdata(Hour%10+0x30); //Hour digit

        LCDwritecomdata(':'); //clock separator:"

//Fill in the "minute" data on the LCD screen-----------------------------------------------

        Min=DS12887read(2); //Read the sub-data of DS12CR887

        LCDwritecomdata(Min/10+0x30);

        LCDwritecomdata(Min%10+0x30);

        LCDwritecomdata(':'); //clock separator:"                               

//Fill in the "seconds" data on the LCD screen-------------------------------------------------

        Sec=DS12887read(0); //Read the second data of DS12CR887

        LCDwritecomdata(Sec/10+0x30);

        LCDwritecomdata(Sec%10+0x30);

        Delay(100);                               

}

void Datedisplay(void)

{

        //LCDwritecom(1);

        LCDwritecom(0xc0);

//Fill in the "year" data on the LCD screen-----------------------------------------------

        LCDwritecomdata('2');

        LCDwritecomdata('0');

        Year=DS12887read(9); //Read the year data of DS12CR887

        LCDwritecomdata(Year/10+0x30); //Year 10 digits

        LCDwritecomdata(Year%10+0x30); //Year digit

        LCDwritecomdata('/'); //clock separator:"

//Fill in the "month" data on the LCD screen-----------------------------------------------

        Month=DS12887read(8); //Read the monthly data of DS12CR887

        LCDwritecomdata(Month/10+0x30);

        LCDwritecomdata(Month%10+0x30);

        LCDwritecomdata('/'); //clock separator:"                               

//Fill in the "day" data on the LCD screen-------------------------------------------------

        Date=DS12887read(7); //Read the daily data of DS12CR887

        LCDwritecomdata(Date/10+0x30);

        LCDwritecomdata(Date%10+0x30);

//Fill in the "week" data on the LCD screen-------------------------------------------------

        Week=DS12887read(6); //Read daily data from DS12CR887

        LCDwritecomdata(0);

        LCDwritecomdata(Week-1+0x30);

        Delay(100);                               

}

void main()

{

//        unsigned char i;

        LCDinit();

        DS12887LCDinit();

  DS12887write(0x0a,0x00); //Start timing, DS12CR887 turns off the clock oscillator

        DS12887write(0,55); //seconds

        DS12887write(2,59);

        DS12887write(4,23);

  DS12887write(6,5); //week

        DS12887write(7,22);  //日

        DS12887write(8,9);  //

        DS12887write(9,12);  //

        //display_Date();

        while(1)

        {

                Timedisplay();

          Datedisplay();

                Delay(100);

        }

}