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HT66F20 Datasheet(PDF) 171 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 171 Page - Holtek Semiconductor Inc |
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171 / 298 page  Rev. 1.90 170 �e���a�� 18� �01� Rev. 1.90 171 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM Register Name Bit 7 6 5 4 3 2 1 0 ADRL(ADR�S=0) D� D� D1 D0 — — — — ADRL(ADR�S=1) D7 D6 D5 D4 D� D� D1 D0 ADRH(ADR�S=0) D11 D10 D9 D8 D7 D6 D5 D4 ADRH(ADR�S=1) — — — — D11 D10 D9 D8 ADCR0 START EOCB ADO�� ADR�S ACS� ACS� ACS1 ACS0 ADCR1 ACS4 V1�5EN — VRE�S — ADCK� ADCK1 ADCK0 ACERL ACE7 ACE6 ACE5 ACE4 ACE� ACE� ACE1 ACE0 ACERH — — — — ACE11 ACE10 ACE9 ACE8 HT66F60 A/D Converter Register List A/D Converter Data Registers – ADRL, ADRH Asthedevicescontainaninternal12-bitA/Dconverter,theyrequiretwodataregisterstostorethe convertedvalue.Theseareahighbyteregister,knownasADRH,andalowbyteregister,known asADRL.Aftertheconversionprocesstakesplace,theseregisterscanbedirectlyreadbythe microcontrollertoobtainthedigitisedconversionvalue.Asonly12bitsofthe16-bitregisterspace isutilised,theformatinwhichthedataisstorediscontrolledbytheADRFSbitintheADCR0 registerasshownintheaccompanyingtable.D0~D11aretheA/Dconversionresultdatabits.Any unusedbitswillbereadaszero. ADRFS ADRH ADRL 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 0 D11 D10 D9 D8 D7 D6 D5 D4 D� D� D1 D0 0 0 0 0 1 0 0 0 0 D11 D10 D9 D8 D7 D6 D5 D4 D� D� D1 D0 A/D Data Registers A/D Converter Control Registers – ADCR0, ADCR1, ACERL, ACERH TocontrolthefunctionandoperationoftheA/Dconverter,threeorfourcontrolregistersknownas ADCR0,ADCR1,ACERLandACERHareprovided.These8-bitregistersdefinefunctionssuch astheselectionofwhichanalogchannelisconnectedtotheinternalA/Dconverter,thedigitised dataformat,theA/DclocksourceaswellascontrollingthestartfunctionandmonitoringtheA/D converterendofconversionstatus.TheACS3~ACS0bitsintheADCR0registerandACS4bitis theADCR1registerdefinetheADCinputchannelnumber.Asthedevicecontainsonlyoneactual analogtodigitalconverterhardwarecircuit,eachoftheindividual8or12analoginputsmustbe routedtotheconverter.ItisthefunctionoftheACS4~ACS0bitstodeterminewhichanalogchannel inputpinsorinternal1.25VisactuallyconnectedtotheinternalA/Dconverter. TheACERHandACERLcontrolregisterscontaintheACER11~ACER0bitswhichdetermine whichpinsonPortA,PE6,PE7,PF0andPF1areusedasanaloginputsfortheA/Dconverterinput andwhichpinsarenottobeusedastheA/Dconverterinput.Settingthecorrespondingbithighwill selecttheA/Dinputfunction,clearingthebittozerowillselecteithertheI/Oorotherpin-shared function.WhenthepinisselectedtobeanA/Dinput,itsoriginalfunctionwhetheritisanI/Oor otherpin-sharedfunctionwillberemoved.Inaddition,anyinternalpull-highresistorsconnectedto thesepinswillbeautomaticallyremovedifthepinisselectedtobeanA/Dinput. |
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