how to reset time in lcd using interrupt(using 89s52 microcontroller)

[manohar]

sir i got output to display time in lcd using 89s52.but i need the help whenever i press the switch in the board the time will start from beginning using external interrupt.
here is the code how to modify the code.

#include<reg51.h>
#define cont_port P3
#define port P1
#define dataport P2 // Data port for LCD
#define m_sec 10
sbit rs = cont_port^0;
sbit rw = cont_port^1;
sbit en = cont_port^6;
sbit dig_hr1=port^0;
sbit dig_min1=port^1;
sbit start=port^2;
sbit am_pm=port^3;
int hr ,hr1=0;
int min,min1=0;
int sec,sec1=0,dig_am_pm=0;

void delay(unsigned int msec) // Time delay funtion
{
int i,j ;
for(i=0;i<msec;i++)
for(j=0;j<1275;j++);
}

void lcd_cmd(unsigned char item) // Function to send command on LCD
{
dataport = item;
rs= 0;
rw=0;
en=1;
delay(1);
en=0;
return;
}

void lcd_data(unsigned char item) // Function to send data on LCD
{
dataport = item;
rs= 1;
rw=0;
en=1;
delay(1);
en=0;
return;
}

void lcd_data_string(unsigned char *str) // Function to send string on LCD
{
int i=0;
while(str!=’’)
{
lcd_data(str);
i++;
delay(1);
}
return;
}

lcd_data_int(int time_val) // Function to send number on LCD
{
int int_amt;
int_amt=time_val/10;
lcd_data(int_amt+48);
int_amt=time_val;
lcd_data(int_amt+48);
}

void lcd(unsigned char str1[10]) // Function to initialize LCD
{
lcd_cmd(0x38); //2 LINE, 5X7 MATRIX
lcd_cmd(0x0e); //DISPLAY ON, CURSOR BLINKING
delay(m_sec);
lcd_data_string(str1);
}

void set_hr1() // Function to set hour
{
hr1++;
if(hr1>11)
hr1=0;
lcd_cmd(0xc3);
lcd_data_int(hr1);
lcd_data(‘:’);
}

void set_min1() // Function to set minute
{
min1++;
if(min1>59)
min1=0;
lcd_cmd(0xc6);
lcd_data_int(min1);
}

void main()
{
int k;
start=1;
dig_hr1=1;
dig_min1=1;
lcd_cmd(0x01);
lcd_cmd(0x83);
lcd(“SET TIMING”);
lcd_cmd(0xc3);
lcd_data_int(hr1);
lcd_data(‘:’);
lcd_data_int(min1);
while(start==0)
{
delay(10);
if(dig_hr1==0)
set_hr1();
if(dig_min1==0)
set_min1();
}

if(am_pm==0)
{
lcd_cmd(0xc8);
lcd_data_string(“am”);
dig_am_pm=0;
}

if(am_pm==1)
{
lcd_cmd(0xc8);
lcd_data_string(“pm”);
dig_am_pm=1;
}
delay(200);
lcd_cmd(0x01);
while(1)
{
for(k=0;k<2;k++)
{
for(hr=hr1;hr<12;hr++)
{
for(min=min1;min<60;min++)
{
for(sec=0;sec<60;sec++)
{
lcd_cmd(0x82);
delay(1);
lcd_data_int(hr);
lcd_data(‘:’);
lcd_data_int(min);
lcd_data(‘:’);
lcd_data_int(sec);
if(dig_am_pm==0)
{
lcd(“am”);
}
else
{
lcd(“pm”);
}
lcd_data_string(” “);
delay(100);
}
}
min1=0;
}
if(dig_am_pm==0)
dig_am_pm=1;
else
dig_am_pm=0;
hr1=0;
}
}
}

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