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HT66F4530 Datasheet(PDF) 128 Page - Holtek Semiconductor Inc |
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HT66F4530 Datasheet(HTML) 128 Page - Holtek Semiconductor Inc |
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128 / 224 page  Rev. 1.00 1�8 De�e��e� �1� �01� Rev. 1.00 1�9 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers Summary of A/D Conversion Steps ThefollowingsummarisestheindividualstepsthatshouldbeexecutedinordertoimplementanA/D conversionprocess. • Step1 SelecttherequiredA/DconversionclockbycorrectlyprogrammingbitsSACKS2~SACKS0in theSADC1register. • Step2 EnabletheA/DbysettingtheADCENbitintheSADC0registertoone. • Step3 SelectwhichsignalistobeconnectedtotheinternalA/Dconverterbycorrectlyconfiguringthe SAINS2~SAINS0bits Selecttheexternalchannelinputtobeconverted,gotoStep4. Selecttheinternalanalogsignaltobeconverted,gotoStep5. • Step4 IftheA/Dinputsignalcomesfromtheexternalchannelinputselectedbyconfiguringthe SAINS2~SAINS0bitsfield,thecorrespondingpinsshouldbeconfiguredasA/Dinputfunction byconfiguringtherelevantpin-sharedfunctioncontrolbits.Thedesiredanalogchannelthen shouldbeselectedbyconfiguringtheSACS3~SACS0bitsfield.Afterthisstep,gotoStep6. • Step5 BeforetheA/Dinputsignalisselectedtocomefromtheinternalanalogsignalbyconfiguring theSAINS2~SAINS0bitsfield,thecorrespondingexternalinputpinmustbeswitchedtoanon- existedchannelinputbyproperlyconfiguredtheSACS3~SACS0bits.Thedesiredinternal analogsignalthencanbeselectedbyconfiguringtheSAINS2~SAINS0bitsfield.Afterthisstep, gotoStep6. • Step6 SelectthereferencevoltagesourcebyconfiguringtheSAVRS1~SAVRS0bitsintheSADC1 register. • Step7 SelectA/DconverteroutputdataformatbysettingtheADRFSbitintheSADC0register. • Step8 IfA/Dconversioninterruptisused,theinterruptcontrolregistersmustbecorrectlyconfigured toensuretheA/Dinterruptfunctionisactive.Themasterinterruptcontrolbit,EMI,andtheA/D conversioninterruptcontrolbit,ADE,mustbothbesethighinadvance. • Step9 TheA/DconversionprocedurecannowbeinitializedbysettingtheSTARTbitfromlowtohigh andthenlowagain. • Step10 IfA/Dconversionisinprogress,theADBZflagwillbesethigh.AftertheA/Dconversion processiscomplete,theADBZflagwillgolowandthentheoutputdatacanbereadfrom SADOHandSADOLregisters. Note:Whencheckingfortheendoftheconversionprocess,ifthemethodofpollingtheADBZbit intheSADC0registerisused,theinterruptenablestepabovecanbeomitted. |
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