CCS C ve 16F628 ile kronometre devresi

#include <16F628A.h>

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES INTRC_IO                 //Internal RC Osc, no CLKOUT
#FUSES NOPUT                    //No Power Up Timer
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NOBROWNOUT               //No brownout reset
#FUSES MCLR                     //Master Clear pin enabled
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD                    //No EE protection

#use delay(clock=4000000)       
#include "new_lcd.c"
#use fast_io(b)
#use fast_io(a)
int8 sad=0,san=0,dak=0,saat=0,durum=0,kur1=1,set=0,atl=0,sadi=0,sani=0,daki=0,sat=0;//DEÐÝÞKENLERÝN TANIMLANMASI


#int_TIMER1 //GERÇEK ZAMANLI SAYIM ÝÇÝN TIMER1 KESMESÝ
void  TIMER1_isr(void) 
{
set_timer1(15510);
sad  ;
sadi--;

}
//KURMA ALT PROGRAMI
void kur(){
   if(input(pin_a1)){
   san  ;
      while(input(pin_a1));
   }
}
//ILERI SAYMASI ICIN ALT PROGRAM
void ileri(){
   if(sad==10){
   san  ;
   sad=0;
   }
      else if(san==60){
      dak  ;
      san=0;
      }
      
      else if(dak==60){
      saat  ;
      dak=0;
      }
      
      else if(saat==24)saat=0;
      
         lcd_gotoxy(1,1);
             printf(lcd_putc,"u:u:u:%u ileri   ",saat,dak,san,sad);
  sadi=sad;
  daki=dak;
  sat=saat;
  sani=san;
  
}

//GERI SAYMASI ICIN ALT PROGRAM
void geri(){
   if(sadi==255){
   sani--;
   sadi=9;
   }
      else if(sani==255){
      daki--;
      sani=59;
      }
      
      else if(daki==255){
      sat--;
      daki=59;
      }
      else if(sat==255)sat=23;
         
         lcd_gotoxy(1,1);
         printf(lcd_putc,"u:u:u:%u geri     ",sat,daki,sani,sadi);
 
  sad=sadi;
  dak=daki;
  saat=sat;
  san=sani;
}  


void main()
{

   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_ccp1(CCP_OFF);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
   enable_interrupts(INT_TIMER1);
   enable_interrupts(GLOBAL);

   set_tris_b(0);
   output_b(0);
   set_tris_a(255);
   output_a(0);
   lcd_init();
   delay_ms(10);
   set_timer1(15510);


while(1){
   
   
   if(input(pin_a0)&& atl==1){ 
      setup_timer_1(T1_DISABLED);
      lcd_gotoxy(1,2);
       printf(lcd_putc,"u:u:u:%u 
u.tur ",saat,dak,san,sad,kur1);
         kur1  ;
         atl=0;
            while(input(pin_a0));
   
   }
      else if(input(pin_a0)&& atl==0){
      setup_timer_1(T1_INTERNAL|T1_DIV_BY_2);
      atl  ;
      while(input(pin_a0));
   
      }
            if(atl==2)atl=0;
            if(input(pin_a1)){
               durum  ;
                  while(input(pin_a1));
            }
                  else if(durum==2)durum=0;
   
     if(durum==0)ileri();
         else if(durum==1)geri();
   
   
     if(input(pin_a2)){
      san=0;
      dak=0;
      saat=0;
      sad=0;
      sani=0;
      daki=0;
      sat=0;
      sadi=0;
      kur1=1;
         lcd_gotoxy(1,2);
            printf(lcd_putc,"u:u:u:%u            ",saat,dak,san,sad);
               setup_timer_1(T1_DISABLED);
               atl=0;

               while(input(pin_a2));
   }  
      if(input(pin_a3)){
            lcd_gotoxy(1,2);
            printf(lcd_putc,"u:u:u:%u 
u.tur ",saat,dak,san,sad,kur1);
            kur1  ;
                while(input(pin_a3));    
     }
}


  }