标签: 低功耗低成本

Typicalembeddedcontrolapplicationsplacedemandssuchaslowpowerconsumption,smallsize,lowcostandreducedcomponentcountontothemicrocontroller.Thisapplicationnoteimplementsa24-hourdigitalclock,alarmand99minute59secondcountdowntimer,yetoperatesontwo“AA”batteries.ThePIC16C54Aisperfectforthisapplication,duetoit’ssmallsize,highcurrentI/OswithdirectLEDdrive,lowcost,fastinstructionthroughputandlowfrequency/cur-rentoperation.AN615ClockDesignUsingLowPower/CostTechniquesClocksystemAuthor:JohnDayA32.768kHzcrystalwaschosenfortheclockduetoSr.,FieldApplicationEngineer,Bostonthelowpowerandcostrequirementsofthisdesign.Thefourinternalphasesofthisinputclockcreateaninter-INTRODUCTIONnalinstructioncycle.Therefore,theinstructiontimeis……