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#include <mega8.h>

int flash_counter=0;
int active_tsop=0;     
int delay=0;

void init_tsop(void)
{
  flash_counter=40;
  GIFR=0b10000000;
  GICR=0b10000000;
}

// External Interrupt 1 service routine
interrupt [EXT_INT1] void ext_int1_isr(void)
{
  active_tsop = 1;
}

// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
  TCNT0=0x91;
  if (flash_counter>0)flash_counter--;
  if (flash_counter==0)
  {
    //TIMSK=0b00000000;
    GICR=0b00000000;   
    delay++;
  }
  else
  {
    PORTC.0 = ~PORTC.0;
  }   
  if (delay==40)
  {
    init_tsop();
    delay=0;
  }
}

void main(void)
{                   
  #asm("wdr")
  WDTCR |= (1<<4)|(1<<3);     
  WDTCR |= (0<<3);
  PORTC=0b00000000;
  DDRC= 0b00000011; 
  PORTD=0b00001000;
  DDRD=0x00;
  TCCR0=0x01;
  MCUCR=0x00;
  #asm("sei") 
  init_tsop();
  TIMSK=0b00000001;

while (1)
      {
         if (flash_counter==0)
         {
           if (active_tsop!=0)
           {
             PORTC.1=1;
           }
           else
           {
             PORTC.1=0;
           }
         }

      };
}

WDTCR |= (1<<4)|(1<<3);       
WDTCR |= (0<<3);

WDTCR |= (1<<4)|(1<<3);       
WDTCR = 0x00;