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HT45F3W 데이터시트(PDF) 108 Page - Holtek Semiconductor Inc |
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HT45F3W 데이터시트(HTML) 108 Page - Holtek Semiconductor Inc |
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108 / 167 page ![]() Rev. 1.50 108 De�e��e� 01� �01� Rev. 1.50 109 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU A/D Input Pins SomeoftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPortBaswellasother functions.ThePCR3~PCR0bitsintheANCSRregister,determinewhethertheinputpinsare setupasA/Dconverteranaloginputsorwhethertheyhaveotherfunctions.IfthePCR3~PCR0 bitsforitscorrespondingpinissethighthenthepinswillbesetuptobeanA/Dconverterinput andtheoriginalpinfunctionsdisabled.Inthisway,pinscanbechangedunderprogramcontrolto changetheirfunctionbetweenA/Dinputsandotherfunctions.Allpull-highresistors,whichare setupthroughregisterprogramming,willbeautomaticallydisconnectedifthepinsaresetupasA/ Dinputs.NotethatitisnotnecessarytofirstsetuptheA/DpinasaninputinthePBCportcontrol registertoenabletheA/DinputaswhenthePCR3~PCR0bitsenableanA/Dinput,thestatusofthe portcontrolregisterwillbeoverridden. TheA/Dconverterhasitsownreferencevoltagepin,VREF,howeverthereferencevoltagecanalso besuppliedfromthepowersupplypin,achoicewhichismadethroughtheVREFSbitintheACSR register.TheanaloginputvaluesmustnotbeallowedtoexceedthevalueofVREF. PB0 A/D Input Structure AN4~AN6arethreeA/Dinternalinputs.AN4,AN5andAN6areconnectedtoPGA2output, PGA1outputandtheSCFPGAoutputrespectively. PGA1 PGA� SCF PGA To ADC AN� To ADC AN4 To ADC AN5 R� R1 C1 C� C3 V+ V- SVIP SVIN SCFR SLPF SCFC VPGAO1 VPGAO� VSCF |
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