ds 1302 应用笔记3816 Selecting a Backup Source for Real-Time Clocks
May26,2006Abstract:MostMaximreal-timeclocks(RTCs)includeasupplyinputforabackuppowersource.ThisalternatesupplysourceallowstheRTCtomaintainthecurrenttimeanddatewhilethemainpowersourceisabsent.Thisapplic