How to make 3Second TURN (ON/OFF) Button for PIC16F877A ??

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//PIC16F 4 MHz External Clock
 
 
#define SW PORTB.F0     //RB0 is used for SW
 
unsigned char time, buttonPressed = 0;
 
//Timer1
//Prescaler 1:1; TMR1 Preload = 60535; Actual Interrupt Time : 5 ms
 
//Place/Copy this part in declaration section
void InitTimer1(){
  T1CON  = 0x01;
  TMR1IF_bit     = 0;
  TMR1H  = 0xEC;
  TMR1L  = 0x77;
  TMR1IE_bit     = 1;
  INTCON     = 0xD8;
}
 
void Interrupt(){
  if (TMR1IF_bit){ 
    TMR1IF_bit = 0;
    
    
    //Enter your code here
    if((SW == 1) && (buttonPressed == 1)){
        time++;
        if(time == 200){
            // put code needed to put PIC in sleep mode here
        }       
    }
    else if((SW == 1) && (buttonPressed == 0)){
        time++;
        if(time == 200){
            // put code needed to wakeup PIC from sleep here
        }       
    }   
    
    TMR1H    = 0xEC;
    TMR1L    = 0x77;
  }
  
  if(INT0IF_bit){
      
      INT0IF_bit = 0;
      
      buttonPressed = ~buttonPressed;   // 0 = ON, 1 = OFF
      time = 0;
  }
} 
 
void main(){
    
    
    TRISB = 0x01;
    PORTB = 0x00;
    
    OPTION_REG = 0x40;
    
    InitTimer1();
    
    while(1){
        
        ;
        
    }   
}