ISR adc

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How many clock cycles would following code consume??

Code: Select all

char replyBuf[32];
uchar *ptr=replyBuf;

ISR(ADC_vect,ISR_NOBLOCK)
{
      ADCSRA&=~(1<<ADIE);
      *ptr++=ADCH;
      ADCSRA|=(1<<ADIE);
}

This causes usb error . is it longer than 25 cycles??