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HT45F5Q Datasheet(PDF) 74 Page - Holtek Semiconductor Inc |
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HT45F5Q Datasheet(HTML) 74 Page - Holtek Semiconductor Inc |
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74 / 114 page  Rev. 1.10 74 De�e��e� 1�� �01� Rev. 1.10 75 De�e��e� 1�� �01� HT45F5Q Charger Flash MCU HT45F5Q Charger Flash MCU A/D Converter Register Description OveralloperationoftheA/Dconverteriscontrolledusingfiveregisters.Areadonlyregisterpair existstostoretheADCdata12-bitvalue.Theremainingthreeregistersarecontrolregisterswhich setuptheoperatingandcontrolfunctionoftheA/Dconverter. Name Bit 7 6 5 4 3 2 1 0 SADOL(ADRFS=0) D� D� D1 D0 — — — — SADOL(ADRFS=1) D7 D� D5 D4 D� D� D1 D0 SADOH(ADRFS=0) D11 D10 D9 D8 D7 D� D5 D4 SADOH(ADRFS=1) — — — — D11 D10 D9 D8 SADC0 START ADBZ ENADC ADRFS SACS� SACS� SACS1 SACS0 SADC1 SAINS� SAINS1 SAINS0 SAVRS1 SAVRS0 SACKS� SACKS1 SACKS0 A/D Converter Data Registers – SADOL, SADOH Asthedevicecontainsaninternal12-bitA/Dconverter,itrequirestwodataregisterstostorethe convertedvalue.Theseareahighbyteregister,knownasSADOH,andalowbyteregister,known asSADOL.Aftertheconversionprocesstakesplace,theseregisterscanbedirectlyreadbythe microcontrollertoobtainthedigitisedconversionvalue.Asonly12bitsofthe16-bitregisterspace isutilised,theformatinwhichthedataisstorediscontrolledbytheADRFSbitintheSADC0 registerasshownintheaccompanyingtable.D0~D11aretheA/Dconversionresultdatabits. Anyunusedbitswillbereadaszero.NotethattheA/Dconverterdataregistercontentswillbe unchangedtozeroiftheA/Dconverterisdisabled. ADRFS SADOH SADOL 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 0 D11 D10 D9 D8 D7 D� D5 D4 D� D� D1 D0 0 0 0 0 1 0 0 0 0 D11 D10 D9 D8 D7 D� D5 D4 D� D� D1 D0 A/D Data Registers A/D Converter Control Registers – SADC0, SADC1, PASR TocontrolthefunctionandoperationoftheA/Dconverter,severalcontrolregistersknownas SADC0andSADC1areprovided.These8-bitregistersdefinefunctionssuchastheselectionof whichanalogchannelisconnectedtotheinternalA/Dconverter,thedigitiseddataformat,theA/D clocksourceaswellascontrollingthestartfunctionandmonitoringtheA/Dconverterbusystatus. TheSACS3~SACS0bitsintheSADC0registerareusedtodeterminewhichexternalchannelinput isselectedtobeconverted.TheSAINS2~SAINS0bitsintheSADC1registerareusedtodetermine thattheanalogsignaltobeconvertedcomesfromtheinternalanalogsignalorexternalanalog channelinput.IftheSAINS2~SAINS0bitsaresetto“000”,theexternalanalogchannelinputis selectedtobeconvertedandtheSACS3~SACS0bitscandeterminewhichexternalchannelis selectedtobeconverted.IftheSAINS2~SAINS0bitsaresetto“001”,theVBGvoltageisselectedto beconverted.IftheSAINS2~SAINS0bitsaresetto“010”,theOPAoutputvoltageisselectedtobe converted.TheinternalanalogsignalscanbederivedfromtheA/Dconvertersupplypower,VDD,or internalreferencevoltage,VREF.Iftheinternalanalogsignalisselectedtobeconverted,theexternal channelsignalinputwillautomaticallybeswitchedofftoavoidthesignalcontention. Thepin-sharedfunctioncontrolregister,namedPASR,containsthecorrespondingpin-shared selectionbitswhichdeterminewhichpinsonPortAareusedasanaloginputsfortheA/Dconverter inputandwhichpinsarenottobeusedastheA/Dconverterinput.Whenthepinisselectedtobe anA/Dinput,itsoriginalfunctionwhetheritisanI/Oorotherpin-sharedfunctionwillberemoved. Inaddition,anyinternalpull-highresistorsconnectedtothesepinswillbeautomaticallyremovedif thepinisselectedtobeanA/Dinput. |
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