AVR-Chat

i have written the code

ISR(ADC_vect)
{
...........
}

main()
{
  SREG=0X80;
  TCCR0=(1<<CS00);
  SFIOR=(1<<ADTS2);
  ADCSRA=(1<<ADEN)|(1<<ADATE)|(1<<ADIE);
  while(1);
}

 why it is not able to trigger the conversion start at
timer0 overflow. kindly help me.


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