ISR(SIG_OUTPUT_COMPARE0B){} und TCNT0 Problem

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DS pp. 75:

Du betreibst Timer0 in Mode #4 (Reserved, also ungültig) anstatt in Mode #2 (CTC):

	// Mode #2 (CTC)
	TCCR0B = (1 << CS00) | (1 << WGM01);