sbit sw_on_off at RB0_bit;
/* Project name:
     Understanding sleep mode in PIC microcontrollers
 * Copyright:
     (c) Rajendra Bhatt
 * Test configuration:
     MCU:             PIC16F628A
     Oscillator:      XT, 4.0000 MHz
*/
int count=0 , count_sleep,sw_on_off_count=0;
char sw_on_off_flag=0 , state_on_off=0;
//Timer1
//Prescaler 1:1; TMR1 Preload = 15536; Actual Interrupt Time : 50 ms

//Place/Copy this part in declaration section
void InitTimer1()
{
  T1CON	 = 0x01;
  TMR1IF_bit	 = 0;
  TMR1H	 = 0x3C;
  TMR1L	 = 0xB0;
  TMR1IE_bit	 = 1;
  //INTCON	 = 0xC0;
}

void Interrupt()
{
   if(INTF_bit==1)
                 {
                  INTF_bit=0;
                  state_on_off=~state_on_off;
                 
                 }
  if (TMR1IF_bit)
  {
    TMR1IF_bit = 0;
    TMR1H	 = 0x3C;
    TMR1L	 = 0xB0;
    //Enter your code here
    count++;
    if(sw_on_off_flag==1)sw_on_off_count++;
  }
}


void main() 
{
TRISB = 0b00000001;
portb=0;
InitTimer1();
INTCON	 = 0xD0;
OPTION_REG=0xC0;
 while(1) {
           if(sw_on_off==0){
                            sw_on_off_flag=1;
                           }

           if( count>=5){
                         count=0;
                         rb1_bit=~rb1_bit;
                         rb2_bit=~rb2_bit;
                         rb3_bit=~rb3_bit;
                        }
           if(state_on_off==255 && sw_on_off_count>5)
                               {
                                sw_on_off_flag=0;
                                sw_on_off_count=0;
                                rb1_bit=0;
                                rb2_bit=0;
                                rb3_bit=0;
                                RB4_bit=1;
                                asm sleep;
                               
                               }

         }
}