[SOLVED] Digital Clock using 89s52/89c52

adambose1990 · Oct 11, 2011

Hi guys, here is a simple project I have done in 89s52 IC of 8051 series. Making a Digital Clock.

Components required:
1 microcontroller 89C52(89S52 will also do)
2 ceramic capacitors-22pF
1 switch(button for reset purpose)
1 electrolytic capacitor-10uF,25V
1 crystal oscillator-11.0592MHz
16x2 LCD display
1 resistor-10k

Software you will need:
The programming of the microcontroller is done using keil compiler. Port 2 is output port, This LCD is in 8bit mode.
Details of LCD you can have here.
**broken link removed**

Circuit Diagram:

The detail explanation of the code is done below:

CODE:

Code C - [expand]
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//main.c
#include <REG51.H>
#include "lcd.h"
 
void ms_delay(int time)
{
        unsigned int i,j;
        for(i=0;i<time; i++)
                for(j=0;j<=1275;j++);
}
 
void main(void)
{  
        int hr=00,min=00,sec=00,flag=0;
        LCD_init();
        LCD_putnum(hr,2);                  //|HH:MM:SS  AM
        LCD_sendstring(":");
        LCD_putnum(min,2);
        LCD_sendstring(":");
        LCD_putnum(sec,2);
        LCD_sendstring("  AM");
   while(1)
   {
        for (sec=0;sec<60;sec++)
    {                          
                LCD_gotoxy(6,0);
                LCD_putnum(sec,2);
                ms_delay(142);
                if (sec==59)
            {
                        min=min+1;
                        if(min==60)
                        {
                                if(hr==11&&sec==59)
                        {
                                        hr=0;
                                        min=0;
                                        sec=-1;
                                        flag=~flag;
                                        LCD_gotoxy(0,0);
                                        LCD_putnum(hr,2);
                                        LCD_gotoxy(3,0);
                                        LCD_putnum(min,2);
                                        LCD_gotoxy(10,0);
                                        if (flag==0)
                                                LCD_sendstring("AM");
                                        else
                                                LCD_sendstring("PM");
                                }
                                else
                                {  
                                        hr=hr+1;
                                        min=0;
                                        LCD_gotoxy(0,0);
                                        LCD_putnum(hr,2);
                                        LCD_gotoxy(3,0);
                                        LCD_putnum(min,2);
                                }
                        }
                        LCD_gotoxy(3,0);
                        LCD_putnum(min,2);
            }
        }
   }           
}

But before that you have to make lcd.h file. Its codes are given also here. This Header is specially made for this program.
CODE:

Code C - [expand]
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//lcd.h
#ifndef __LCD_H__
#define __LCD_H__
 
#define LCD_data P2
 
 
void _LCD_busy(void);
void _LCD_sdelay(void);
void _LCD_poweron(void);
void _LCD_command(unsigned char);
void _LCD_senddata(unsigned char);
void _LCD_sendstring(unsigned char *);
void _LCD_putnum(int, int);
void _LCD_init(void);
void _LCD_clear(void);
 
sbit LCD_rs=P1^0;
sbit LCD_rw=P1^1;
sbit LCD_en=P1^2;
 
void LCD_busy()
{
    unsigned char i,j;
        for(i=0;i<50;i++)
                for(j=0;j<255;j++);
}
 
void LCD_sdelay()
{
    unsigned char i;
        for(i=0;i<50;i++);
}
 
void LCD_poweron()
{
unsigned int i;
for (i=0;i<22500; i++);
}
 
void LCD_command(unsigned char var)
{
     LCD_data  = var;      //Function set: 2 Line, 8-bit, 5x8 dots
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in instruction register
     LCD_en   = 1;        //Enable H->L
     LCD_en   = 0;
     LCD_busy();          //Wait for LCD to process the command
}
 
void LCD_putnum(int number,int width)// LCD_putnum: Implementing integer value from -99999 to 99999
{
   unsigned char digit;
 
   if (number < 0)
   {
     LCD_senddata('-');
         LCD_sdelay();
         number = -1 * number;
   }
 
   switch (width)
   {
                case 5:
                        digit = '0';
                        while(number >= 10000)                // Keep Looping for larger than 10
                        {
                        digit++;                         // Increase ASCII character
                        number -= 10000;                    // Subtract number with 10
                        }
                        LCD_senddata(digit);                // Put the Second digit
                        LCD_sdelay();
           case 4:
                        digit = '0';
                        while(number >= 1000)                // Keep Looping for larger than 10
                        {
                        digit++;                         // Increase ASCII character
                        number -= 1000;                    // Subtract number with 10
                        }
                        LCD_senddata(digit);                // Put the Second digit
                        LCD_sdelay();
                case 3:
                        digit = '0';
                        while(number >= 100)                // Keep Looping for larger than 10
                        {
                        digit++;                         // Increase ASCII character
                        number -= 100;                    // Subtract number with 10
                        }
                        LCD_senddata(digit);                // Put the Second digit
                        LCD_sdelay();
                case 2:
                        digit = '0';
                        while(number >= 10)                // Keep Looping for larger than 10
                        {
                        digit++;                         // Increase ASCII character
                        number -= 10;                    // Subtract number with 10
                        }
                        LCD_senddata(digit);                // Put the Second digit
                        LCD_sdelay();
                case 1:
                        LCD_senddata('0' + number);           // Put the First digit
                        LCD_sdelay();
   }
}
 
void LCD_sendstring(unsigned char *var)
{
     while(*var)              //till string ends
       LCD_senddata(*var++);  //send characters one by one
}
 
void LCD_senddata(unsigned char var)
{
     P2  = var;      //Function set: 2 Line, 8-bit, 5x7 dots
     LCD_rs   = 1;        //Selected data register
     LCD_rw   = 0;        //We are writing
     LCD_en   = 1;        //Enable H->L
     LCD_en   = 0;
     //LCD_busy();          //Wait for LCD to process the command
}
 
void LCD_init(void)
{
     LCD_data = 0x38;     //Function set: 2 Line, 8-bit, 5x8 dots
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in data register
     LCD_en   = 1;        //Enable H->L
     LCD_en   = 0;
     LCD_busy();          //Wait for LCD to process the command
     LCD_data  = 0x0C;     //Display on, Curson blinking off command
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in data register
     LCD_en   = 1;        //Enable H->L
     LCD_en   = 0;
     LCD_busy();          //Wait for LCD to process the command
     LCD_data  = 0x01;     //Clear LCD
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in data register
     LCD_en   = 1;        //Enable H->L
     LCD_en   = 0;
     LCD_busy();          //Wait for LCD to process the command
     LCD_data  = 0x06;     //Entry mode, auto increment with no shift
     LCD_rs   = 0;        //Selected command register
     LCD_rw   = 0;        //We are writing in data register
     LCD_en   = 1;        //Enable H->L
     LCD_en   = 0;        //Enable H->L
     LCD_busy();
}
 
void LCD_clear(void)
{
        LCD_data  = 0x01;     //Clear LCD
    LCD_rs   = 0;        //Selected command register
    LCD_rw   = 0;        //We are writing in data register
    LCD_en   = 1;        //Enable H->L
    LCD_en   = 0;
    LCD_busy();
}
 
     
void LCD_gotoxy(int x, int y)//x=0..16, y= 0..1
{      
  int dr;
  if (y==0)
        dr=x+0x80;      
  if (y==1)      
    dr=x+0xC0;            
  LCD_data  = dr;      //Function set: 2 Line, 8-bit, 5x8 dots
  LCD_rs   = 0;        //Selected command register
  LCD_rw   = 0;        //We are writing in instruction register
  LCD_en   = 1;        //Enable H->L
  LCD_en   = 0;
  LCD_busy();        
}
 
#endif

Thanks a lot...
For any quarries you can contact adambose1990@gmail.com

You can download the following attachents
.Hex file
.H file
.C file // for keil
.DSN file // for proteus
They are all in rar file. Extract them all.
View attachment Desktop.rar

PAIJO SULOYO · Jun 16, 2012

have u ASM code of your project?

adambose1990 · Jun 16, 2012

PAIJO SULOYO said:
have u ASM code of your project?

no, actually not, I don't know much about Assembly Language. I am sorry...

papunblg · Jun 16, 2012

Without a RTC chip, using C compiler --- How accurate is your clock?

Muhammad Amir Khan · Jul 29, 2012

dear frnds ...........em making digital base clock and At89c51........em posting coad in c....plz help me it is right....

sbit LCD_RS at P3_7_bit;
sbit LCD_EN at P3_6_bit;
sbit LCD_D0 at P2_0_bit;
sbit LCD_D1 at P2_1_bit;
sbit LCD_D2 at P2_2_bit;
sbit LCD_D3 at P2_3_bit;
sbit LCD_D4 at P2_4_bit;
sbit LCD_D5 at P2_5_bit;
sbit LCD_D6 at P2_6_bit;
sbit LCD_D7 at P2_7_bit;
Lcd_Init(); // Initialize Lcd
Lcd_Cmd(_LCD_CLEAR); // lcd clear
void main(void)
{
int hr=00,min=00,sec=00;
LCD_init();
LCD_chr(1,1,hr); //|HH:MM:SS AM
LCD_out(1,4,":");
LCD_chr(1,6,min);
LCD_out(1,8,":");
LCD_chr(1,10,sec);

while(1)
{
for (sec=0;sec<60;sec++)
{

LCD_chr(1,10,sec);
if (sec==59)
{
min=min+1;
if(min==60)
{
if(hr==11&&sec==59)
{
hr=0;
min=0;
sec=-1;
LCD_chr(1,1,hr);
LCD_chr(1,6,min);
}
else
{
hr=hr+1;
min=0;
LCD_chr(1,1,hr);
LCD_chr(1,6,min);

}
}
LCD_chr(1,6,min);
}
}
}
}

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[SOLVED] Digital Clock using 89s52/89c52

adambose1990

Newbie level 4

PAIJO SULOYO

Newbie level 4

adambose1990

Newbie level 4

papunblg

Advanced Member level 3

Muhammad Amir Khan

Newbie level 1

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