//timer1 interrupt
//Press spacebar to get time
//display Time 00:00:00
//#include <16F628.h>
#include <16F648A.h>
#use delay(clock=4000000)
#fuses XT,PUT,BROWNOUT,MCLR,NOWDT,NOPROTECT,NOLVP
#define  TxD         PIN_A0   
#define  RxD         PIN_A1   
#use rs232(baud=9600, xmit=TxD,rcv=RxD) 

int hour,min,sec;
int TmSum=0;

#INT_TIMER1
void INTTM1(void) 
{
 TmSum++;
 set_timer1(3036);              //Reload
}

void main(void) 
{
   enable_interrupts(GLOBAL);       
   enable_interrupts(INT_TIMER1);   

   setup_timer_1(T1_INTERNAL | T1_DIV_BY_8);
   set_timer1(3036);                        

   hour =0; 
   min = 0; 
   sec = 0; 

   printf("Interrupt Timer1 press Any key to get Time\r\n");
   while(TRUE) 
   {
    if(TmSum>2) 
    {
     printf(".");  
     if(++sec==60) 
     {         
      sec = 0;
      if(++min==60)
      {
       min = 0;
       if(++hour==24)
          hour = 0;
      }
     }
     TmSum = 0;
    }
    //Press Any key to get time
    if(kbhit())
     printf("\r\nTime:%02d:%02d:%02d\r\n",hour,min,sec);
   }
}