Click on the link to open the Real Time Counter (RTC) in the MCC Melody API reference for AVR: https://onlinedocs.microchip.com/v2/keyword-lookup?keyword=SCF-AVR8-RTC-V1&version=latest&redirect=true 00:00 Part 1: Using the PIT to wake the CPU: In this video an MCC Melody Project is created, which uses the Periodic Interrupt Timer (PIT) function of the RTC to wake up the CPU. Every second a PIT interrupt wakes the AVR from Power Down mode, then in the PIT callback a LED is toggled, before we put the CPU to sleep again. 04:27 Part 2: Using the PIC with the Event System: We refactor the application, demonstrating how the Periodic Interrupt Timer works with the Event System. The same functionality, of a LED toggling every second is kept, without any code running. NOTE: The EVSYSEVOUTx pin (Event System event out), will pulse on a RTC_CMP or RTC_OVF event, but will toggle on a PIT event.