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HT66F019 Datasheet(PDF) 108 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 108 Page - Holtek Semiconductor Inc |
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108 / 175 page  Rev. 1.00 108 De�e��e� 01� �01� Rev. 1.00 109 De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM Conversion Rate and Timing Diagram AcompleteA/Dconversioncontainstwoparts,datasamplinganddataconversion.Thedata samplingwhichisdefinedastADStakes4A/Dclockcyclesandthedataconversiontakes12A/D clockcycles.Thereforeatotalof16A/DclockcyclesforanexternalinputA/Dconversionwhichis definedastADCarenecessary. MaximumsingleA/Dconversionrate=A/Dclockperiod÷16 Theaccompanyingdiagramshowsgraphicallythevariousstagesinvolvedinananalogtodigital conversionprocessanditsassociatedtiming.AfteranA/Dconversionprocesshasbeeninitiated bytheapplicationprogram,themicrocontrollerinternalhardwarewillbegintocarryoutthe conversion,duringwhichtimetheprogramcancontinuewithotherfunctions.Thetimetakenforthe A/Dconversionis16tADCKclockcycleswheretADCKisequaltotheA/Dclockperiod. ADCEN START ADBZ SACS[3:0] off on off on tON�ST tADS A/D sa�pling ti�e tADS A/D sa�pling ti�e Sta�t of A/D �onve�sion Sta�t of A/D �onve�sion Sta�t of A/D �onve�sion End of A/D �onve�sion End of A/D �onve�sion tADC A/D �onve�sion ti�e tADC A/D �onve�sion ti�e tADC A/D �onve�sion ti�e 0011B 0010B 0000B 0001B A/D �hannel swit�h A/D Conversion Timing Summary of A/D Conversion Steps ThefollowingsummarisestheindividualstepsthatshouldbeexecutedinordertoimplementanA/D conversionprocess. • Step1 SelecttherequiredA/DconversionclockbycorrectlyprogrammingbitsSACKS2~SACKS0in theSADC1register. • Step2 EnabletheA/DbysettingtheADCENbitintheSADC0registerto1. • Step3 SelectwhichsignalistobeconnectedtotheinternalA/Dconverterbycorrectlyconfiguringthe SAINS2~SAINS0bits. Selecttheexternalchannelinputtobeconverted,gotoStep4. Selecttheinternalanalogsignaltobeconverted,gotoStep5. • Step4 IftheA/Dinputsignalcomesfromtheexternalchannelinputselectedbyconfiguringthe SAINSbitfield,thecorrespondingpinsshouldbeconfiguredasA/Dinputfunctionbycorrectly programmingtheACE7~ACE0bitsintheACERLregister.Thedesiredanalogchannelthen shouldbeselectedbyconfiguringtheSACSbitfield.Afterthisstep,gotoStep6. |
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