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Interrupts allow the processor to suspend normal operation temporarily so that a high-priority software or hardware event can be handled instead.

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Interrupt every second on ATTiny84 (and sleep the rest)

However, the ATTiny84 doesn't have an asynchronous Timer2 like the ATMega328 and does not have a power save mode, so it cannot wake up from the Timer2 interrupt as is suggested in that post. …