HT66F4530 datasheet(128/224 Pages) HOLTEK

128 / 224 page

Rev. 1.00

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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

• 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.

HT66F4530 数据表(PDF) 128 Page - Holtek Semiconductor Inc

HT66F4530 数据表(HTML) 128 Page - Holtek Semiconductor Inc

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