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HT66F019 Datasheet(PDF) 112 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 112 Page - Holtek Semiconductor Inc |
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112 / 175 page  Rev. 1.00 11� De�e��e� 01� �01� Rev. 1.00 113 De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM Comparator Ananalogcomparatoriscontainedwithinthedevice.Thecomparatorfunctionoffersflexibility viatheirregistercontrolledfeaturessuchaspower-down,polarityselect,hysteresisetc.Insharing theirpinswithnormalI/OpinsthecomparatorsdonotwastepreciousI/Opinsiftherefunctionsare otherwiseunused. C+ CPOL COUT CINT COS CX C- - + Comparator Comparator Operation Thedevicecontainsacomparatorfunctionwhichisusedtocomparetwoanalogvoltagesand provideanoutputbasedontheirinputdifference.Fullcontrolovertheinternalcomparatoris providedviathecontrolregister,CPC.Thecomparatoroutputisrecordedviaabitinthecontrol register,butcanalsobetransferredoutputontoasharedI/Opin.Additionalcomparatorfunctions includepolarity,hysteresisfunctionandpowerdowncontrol. Anypull-highresistorsconnectedtothesharedcomparatorinputpinswillbeautomatically disconnectedwhenthecorrespondingcomparatorfunctionalpinsareselected.Asthecomparator inputsapproachtheirswitchinglevel,somespuriousoutputsignalsmaybegeneratedonthe comparatoroutputduetotheslowrisingorfallingnatureoftheinputsignals.Thiscanbeminimised bythehysteresisfunctionwhichwillapplyasmallamountofpositivefeedbacktothecomparator. Ideallythecomparatorshouldswitchatthepointwherethepositiveandnegativeinputssignalsare atthesamevoltagelevel.However,unavoidableinputoffsetsintroducesomeuncertaintieshere.The offsetcalibrationfunction,ifexecuted,willminimizetheswitchingoffsetvalue. Comparator Interrupt Thecomparatorpossessesitsowninterruptfunction.Whenthecomparatoroutputchangesstate, itsrelevantinterruptflagwillbeset,andifthecorrespondinginterruptenablebitisset,thenajump toitsrelevantinterruptvectorwillbeexecuted.NotethatitisthechangingstateoftheCOUTbit andnottheoutputpinwhichgeneratesaninterrupt.IfthemicrocontrollerisintheSLEEPorIDLE ModeandtheComparatorisenabled,theniftheexternalinputlinescausetheComparatoroutputto changestate,theresultinggeneratedinterruptflagwillalsogenerateawake-up.Ifitisrequiredto disableawake-upfromoccurring,thentheinterruptflagshouldbefirstsethighbeforeenteringthe SLEEPorIDLEMode. Programming Considerations Ifthecomparatorisenabled,itwillremainactivewhenthemicrocontrollerenterstheSLEEPor IDLEMode,howeverasitwillconsumeacertainamountofpower,theusermaywishtoconsider disablingitbeforetheSLEEPorIDLEModeisentered.Ascomparatorpinsaresharedwithnormal I/OpinstheI/Oregistersforthesepinswillbereadaszero(portcontrolregisteris"1")orreadas portdataregistervalue(portcontrolregisteris"0")ifthecomparatorfunctionisenabled. |
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