title: How does Contiki OS process external interrupts?
body: <p>It is possible to wake sensor nodes on external interrupts that are generated by peripheral sensors. The following explains how Contiki OS handles external interrupts. In case of the <code>ATmega128RFA1</code> the external interrupts <code>INT0</code> to <code>INT4</code> are able to wake the MCU even from <strong>deep sleep</strong>.</p>