HT45F4MA datasheet(100/145 Pages) HOLTEK

100 / 145 page

Rev. 1.20

100

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Rev. 1.20

101

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HT45F4MA/HT45FH4MA/HT45FH4MA-1

Power Bank Flash MCU

HT45F4MA/HT45FH4MA/HT45FH4MA-1

Power Bank Flash MCU

Summary of A/D Conversion Steps

ThefollowingsummarisestheindividualstepsthatshouldbeexecutedinordertoimplementanA/D

conversionprocess.

• Step1

SelecttherequiredA/DconversionclockbycorrectlyprogrammingbitsADCK2~ADCK0inthe

ADCR1register.

• Step2

EnabletheA/DbyclearingtheADOFFbitintheADCR0registertozero.

• Step3

SelectwhichchannelistobeconnectedtotheinternalA/Dconverterbycorrectlyprogramming

theACS4~ACS0bitswhicharealsocontainedintheADCR1andADCR0register.

• Step4

SelectwhichpinsaretobeusedasA/Dinputsandconfigurethembycorrectlyprogrammingthe

ACE7~ACE0bitsintheACERLregister.

• Step5

Iftheinterruptsaretobeused,theinterruptcontrolregistersmustbecorrectlyconfiguredto

ensuretheA/Dconverterinterruptfunctionisactive.Themasterinterruptcontrolbit,EMI,and

theA/Dconverterinterruptbit,ADE,mustbothbesethightodothis.

• Step6

TheanalogtodigitalconversionprocesscannowbeinitialisedbysettingtheSTARTbitin

theADCR0registerfromlowtohighandthenlowagain.Notethatthisbitshouldhavebeen

originallyclearedtozero.

• Step7

Tocheckwhentheanalogtodigitalconversionprocessiscomplete,theEOCBbitintheADCR0

registercanbepolled.Theconversionprocessiscompletewhenthisbitgoeslow.Whenthis

occurstheA/DdataregistersADRLandADRHcanbereadtoobtaintheconversionvalue.Asan

alternativemethod,iftheinterruptsareenabledandthestackisnotfull,theprogramcanwaitfor

anA/Dinterrupttooccur.

Note:Whencheckingfortheendoftheconversionprocess,ifthemethodofpollingtheEOCBbit

intheADCR0registerisused,theinterruptenablestepabovecanbeomitted.

Theaccompanyingdiagramshowsgraphicallythevariousstagesinvolvedinananalogtodigital

conversionprocessanditsassociatedtiming.AfteranA/Dconversionprocesshasbeeninitiated

bytheapplicationprogram,themicrocontrollerinternalhardwarewillbegintocarryoutthe

conversion,duringwhichtimetheprogramcancontinuewithotherfunctions.Thetimetakenforthe

A/Dconversionis16tADCKwheretADCKisequaltotheA/Dclockperiod.

HT45F4MA Datasheet(PDF) 100 Page - Holtek Semiconductor Inc

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