https://github.com/MicrochipTech/avr_insights In this video we will have a look at the asynchronous timer of AVR MCU, the RTC. This timer can be used together with an external high accuracy crystal or crystal to make a real time counter(RTC) for your system. Documentation references -------------------------------------------------------------- Atmel Tools Documentation: https://mchp.us/2VVvDjm AVR Libc reference manual: https://mchp.us/2JifgaA ATmega324PB datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/40001908A.pdf#page=201 ATMega324PB Xplained Pro User Guide - Crystals information: http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-42633-ATmega324PB-Xplained-Pro_User-Guide.pdf#page=16 App note AVR134: Real Time Clock (RTC) Using the Asynchronous Timer: http://www.microchip.com//wwwAppNotes/AppNotes.aspx?appnote=en591232