BEGIN Visit( Dallas Semiconductor website, http://www.dalsemi.com/ ); In 'Part No Search' box Type "DS1307"; On the resulting 'QuickView Data Sheet page Goto the Datasheet & Application Note links; For Each Application Note Do BEGIN Read; Mark; Learn; Inwardly Digest END; Do Your project; If You have a specific quesion Then Post it here; Until Finished; END.