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Replying to @josecastillo

reading list:
• AT04296: Low Power Features of SAM L Series Devices
• AT06549: Ultra Low Power Techniques
http://ww1.microchip.com/downloads/en/AppNotes/Atmel-42412-Low-Power-Features-of-SAM-L-Series-Devices_ApplicationNote_AT04296.pdf
https://www.microchip.com/content/dam/mchp/documents/OTH/ApplicationNotes/ApplicationNotes/Atmel-42411-Ultra-Low-Power-Techniques-AT06549_Application-Note.pdf

(original)