#if defined (__IOM8_H) in r16, MCUCR andi r16, ~((1<<ISC11)+(1<<ISC10)+(1<<ISC01)+(1<<ISC00)) ori r16, ISC out MCUCR, r16#elif defined (__IOM88_H) ldi r16, ISC sts EICRA, r16#else #error Bull Shit!#endif