ds12885数据手册
FEATURES•Drop–inreplacementforIBMATcomputerclock/calendar•PinconfigurationcloselymatchesMC146818BandDS1285•Countsseconds,minutes,hours,days,dayoftheweek,date,month,andyearwithleapyearcompensationvalidupto2100•BinaryorBCDrepresentationoftime,calendar,andalarm•12–or24–hourclockwith
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