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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HT67F5652 bảng dữ liệu(PDF) 129 Page - Holtek Semiconductor Inc |
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HT67F5652 bảng dữ liệu(HTML) 129 Page - Holtek Semiconductor Inc |
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129 / 224 page  Rev. 1.00 1�8 De�e��e� 0�� �01� Rev. 1.00 1�9 De�e��e� 0�� �01� HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU ToenabletheADC,thefirststepistodisabletheADCpowerdownandsleepmode,tomakesure theADCispoweredup.TheADRSTbitintheADCR0registerisusedtostartandresettheA/D converterafterpoweron.Whenthemicrocontrollersetsthisbitfromlowtohighandthenlow again,ananalogtodigitalconverteddatainSINCfilterwillbeinitiated.Afterthissetupiscomplete, theADCisreadyforoperation.Thesethreebitsareusedtocontroltheoverallstartoperationofthe internalanalogtodigitalconverter. TheEOCbitintheADCR1registerisusedtoindicatewhentheanalogtodigitalconversionprocess iscomplete.Thisbitwillbeautomaticallysethighbythemicrocontrollerafteraconversioncycle hasended.Inaddition,thecorrespondingA/Dinterruptrequestflagwillbesetintheinterrupt controlregister,andiftheinterruptsareenabled,anappropriateinternalinterruptsignalwillbe generated.ThisA/DinternalinterruptsignalwilldirecttheprogramflowtotheassociatedA/D internalinterruptaddressforprocessing.IftheA/Dinternalinterruptisdisabled,themicrocontroller canbeusedtopolltheEOCbitintheADCR1registertocheckwhetherithasbeenset"1"asan alternativemethodofdetectingtheendofanA/Dconversioncycle.TheADCconverteddatawill beupdatedcontinuouslybythenewconverteddata.IftheADCconverteddatalatchfunctionis enabled,thelatestconverteddatawillbelatchedandthefollowingnewconverteddatawillbe discardeduntilthisdatalatchfunctionisdisabled. TheclocksourcefortheA/Dconvertershouldbetypicallyfixedatavalueof4.9152MHz,which originatesfromthesystemclockfSYS,andcanbechosentobeeitherfSYSorasubdividedversion offSYS.ThedivisionratiovalueisdeterminedbytheADCK4~ADCK0bitsintheADCSregisterto obtaina4.9152MHzclocksourcefortheADC. ThedifferentialreferencevoltagesupplytotheA/DConvertercanbesuppliedfromeitherthe internalpowersupplypins,VCMandAVSS,orfromanexternalreferencesourcesuppliedonpins, VREFPandVREFN.ThedesiredselectionismadeusingtheVREFSbitintheADCR0register. |
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