Hi Jonny,

To my understanding the 80XX chips will not be awaken by an interupt. Once u have power down it, the only way to wake it up is by a hardware RESET.

However if you are worried about power and want to reduce power consumption, try putting the chip into standyby mode. This will reduce power, and yet allows it to be awaken when a interupt is detected.

Wish you the best.

Chow.