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HT45F39 Datasheet(PDF) 64 Page - Holtek Semiconductor Inc |
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HT45F39 Datasheet(HTML) 64 Page - Holtek Semiconductor Inc |
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64 / 102 page  Rev. 1.10 64 July 01, 2016 Rev. 1.10 65 July 01, 2016 HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU Summary of A/D Conversion Steps ThefollowingsummarisestheindividualstepsthatshouldbeexecutedinordertoimplementanA/ Dconversionprocess. • Step1 SelecttherequiredA/DconversionclockbycorrectlyprogrammingbitsADCK2~ADCK0inthe ADCR1register. • Step2 EnabletheA/DbyclearingtheADOFFbitintheADCR0registertozero. • Step3 SelectwhichchannelistobeconnectedtotheinternalA/Dconverterbycorrectlyprogramming theACS4~ACS0bitswhicharealsocontainedintheADCR1andADCR0registers. • 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/DdataregisterADRcanbereadtoobtaintheconversionvalue.Asanalternative method,iftheinterruptsareenabledandthestackisnotfull,theprogramcanwaitforanA/D interrupttooccur. Note:Whencheckingfortheendoftheconversionprocess,ifthemethodofpollingtheEOCBbit intheADCR0registerisused,theinterruptenablestepabovecanbeomitted. Theaccompanyingdiagramshowsgraphicallythevariousstagesinvolvedinananalogtodigital conversionprocessanditsassociatedtiming.AfteranA/Dconversionprocesshasbeeninitiated bytheapplicationprogram,themicrocontrollerinternalhardwarewillbegintocarryoutthe conversion,duringwhichtimetheprogramcancontinuewithotherfunctions.Thetimetakenforthe A/Dconversionis106tADCKwheretADCKisequaltotheA/Dclockperiod. Programming Considerations DuringmicrocontrolleroperationswheretheA/Dconverterisnotbeingused,theA/Dinternal circuitrycanbeswitchedofftoreducepowerconsumption,bysettingbitADOFFhighinthe ADCR0register.Whenthishappens,theinternalA/Dconvertercircuitswillnotconsumepower irrespectiveofwhatanalogvoltageisappliedtotheirinputlines.IftheA/Dconverterinputlinesare usedasnormalI/Os,thencaremustbetakenasiftheinputvoltageisnotatavalidlogiclevel,then thismayleadtosomeincreaseinpowerconsumption. |
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