attach interrupt rtc timer in General Posted April 29, 2018 I think that for the most part Energia maintains the same functions and API as found in Arduino which does not have a RTC interrupt listed in the base reference. And while it might be possible to add it to Energia, I don’t believe it has been done. Nonetheless, the RTC can be accessed as mentioned above. I don’t use Energia much anymore but In the LaunchPads I have the crystal is active. If you really want control of such things however it is probably best to use CCS.