Timer_1 setup in PIC16F877A

#include "16f877a.h" 
#device adc=10 
#fuses HS,NOWDT,NOLVP,NOCPD,NODEBUG
#use delay(clock=4M) 

 

float volt, oldval,volt1 ;

int count=0

#int_timer2

void timer2_isr(void) 
{
 //clock=clock++;
x=get_timer2();
set_timer2(0);
   } 

 
void main()
{
    set_tris_a(0xff);
    set_tris_b(0x00);
    set_tris_c(0x00);
     set_tris_d(0x00);
    
//Analog module configuration for reading the voltage from the PIN_AN0
    setup_comparator(NC_NC_NC_NC);
    setup_adc(ADC_CLOCK_INTERNAL);
    setup_adc_ports(AN0);
    set_adc_channel(0); 
      setup_vref(FALSE);

//Interrupt uses for counting 3 seconds

setup_timer_2(T0_INTERNAL | T0_DIV_BY_8);
  enable_interrupts(INT_TIMER2);
  enable_interrupts(GLOBAL); 
    
    while(1)
    {
        delay_us(20);
        read_adc(adc_start_only);
        delay_us(100);
        volt = read_adc(adc_read_only);
        volt = volt * 30.0/ 1023.0;
                
      if(volt>1)

                {
delay_ms(3);
output_high(PIN_D0);

	}
else if((x<=125)&&(volt>1) //turn off the led on D1 
{
output_high(PIN_D0);


}
 }    
}