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HT66F019 Datasheet(PDF) 103 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 103 Page - Holtek Semiconductor Inc |
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103 / 175 page  Rev. 1.00 10� De�e��e� 01� �01� Rev. 1.00 103 De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM A/D Converter Register Description OveralloperationoftheA/Dconverteriscontrolledusingseveralregisters.Areadonlyregisterpair existstostoretheA/Dconverterdata12-bitvalue.Theremainingtworegistersarecontrolregisters whichsetuptheoperatingandcontrolfunctionoftheA/Dconverter. Register Name Bit 7 6 5 4 3 2 1 0 SADOH (ADRFS=0) D11 D10 D9 D8 D� D6 D5 D4 SADOL (ADRFS=0) D3 D� D1 D0 — — — — SADOH (ADRFS=1) — — — — D11 D10 D9 D8 SADOL (ADRFS=1) D� D6 D5 D4 D3 D� D1 D0 SADC0 START ADBZ ADCEN ADRFS SACS3 SACS� SACS1 SACS0 SADC1 SAINS� SAINS1 SAINS0 SAVRS1 SAVRS0 SACKS� SACKS1 SACKS0 ACERL ACE� ACE6 ACE5 ACE4 ACE3 ACE� ACE1 ACE0 A/D Converter Register List 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.Any unusedbitswillbereadaszero.NotethatA/DConverterdataregistercontentswillbeunchangedif theA/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 D� D6 D5 D4 D3 D� D1 D0 0 0 0 0 1 0 0 0 0 D11 D10 D9 D8 D� D6 D5 D4 D3 D� D1 D0 A/D Data Register Pair A/D Converter Control Registers – SADC0, SADC1, ACERL TocontrolthefunctionandoperationoftheA/Dconverter,threecontrolregistersknownasSADC0 andSADC1andACERLareprovided.These8-bitregistersdefinefunctionssuchastheselectionof whichanalogchannelisconnectedtotheinternalA/Dconverter,thedigitiseddataformat,theA/D clocksourceaswellascontrollingthestartfunctionandmonitoringtheA/Dconverterbusystatus. Asthedevicecontainsonlyoneactualanalogtodigitalconverterhardwarecircuit,eachofthe externalorinternalanalogsignalinputsmustberoutedtotheconverter.TheSACS3~SACS0bitsin theSADC0registerareusedtodeterminewhichexternalchannelinputisselectedtobeconverted. TheSAINS2~SAINS0bitsintheSADC1registerareusedtodeterminethattheanalogsignaltobe convertedcomesfromtheinternalanalogsignalorexternalanalogchannelinput. TheACERLcontrolregistercontainstheACE7~ACE0bitswhichdeterminewhichpinsonI/OPort areusedasanaloginputsfortheA/DconverterinputandwhichpinsarenottobeusedastheA/D converterinput.SettingthecorrespondingbithighwillselecttheA/Dinputfunction,clearingthe bittozerowillselecteithertheI/Oorotherpin-sharedfunction.Whenthepinisselectedtobean A/Dinput,itsoriginalfunctionwhetheritisanI/Oorotherpin-sharedfunctionwillberemoved.In addition,anyinternalpull-highresistorsconnectedtothesepinswillbeautomaticallyremovedifthe pinisselectedtobeanA/Dinput. |
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