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HT45R4U датащи(PDF) 53 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 53 Page - Holtek Semiconductor Inc |
53 / 105 page Rev. 1.10 �� �a��� 1�� �01� Rev. 1.10 �3 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Controllingthepoweron/offfunctionoftheA/Dconvertercircuitryisimplementedusingthe ADOFFbitintheADCR0register.ThisbitmustbezerotopowerontheA/Dconverter.Whenthe ADOFFbitisclearedtozerotopowerontheA/Dconverterinternalcircuitryacertaindelay,as indicatedinthetimingdiagram,mustbeallowedbeforeanA/Dconversionisinitiated.Evenifno pinsareselectedforuseasA/DinputsbyclearingtheACE7~ACE0bitsintheACERregister,if theADOFFbitiszerothensomepowerwillstillbeconsumed.Inpowerconsciousapplicationsit isthereforerecommendedthattheADOFFissethightoreducepowerconsumptionwhentheA/D converterfunctionisnotbeingused. ThereferencevoltagesupplytotheA/DConvertercanbesuppliedfromeitherthepositivepower supplypin,VDD,orfromanexternalreferencesourcessuppliedonpinVREF.Thedesiredselection ismadeusingtheVREFSbit.AstheVREFpinispin-sharedwithotherfunctions,whentheVREFS bitissethigh,theVREFpinfunctionwillbeselectedandtheotherpinfunctionswillbedisabled automatically. A/D Input Pins AlloftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPE0,PA6andPB2~PB7aswell asotherfunctions.TheACE7~ACE0bitsintheACERregister,determinewhethertheinputpins aresetupasA/Dconverteranaloginputsorwhethertheyhaveotherfunctions.IftheACE7~ACE0 bitsforitscorrespondingpinissethighthenthepinwillbesetuptobeanA/Dconverterinput andtheoriginalpinfunctionsdisabled.Inthisway,pinscanbechangedunderprogramcontrolto changetheirfunctionbetweenA/Dinputsandotherfunctions.Allpull-highresistors,whichare setupthroughregisterprogramming,willbeautomaticallydisconnectedifthepinsaresetupasA/ Dinputs.NotethatitisnotnecessarytofirstsetuptheA/DpinasaninputinthePAC,PECorPBC portcontrolregistertoenabletheA/DinputaswhentheACE7~ACE0bitsenableanA/Dinput,the statusoftheportcontrolregisterwillbeoverridden. TheA/Dconverterhasitsownreferencevoltagepin,VREF,howeverthereferencevoltagecan alsobesuppliedfromthepowersupplypin,achoicewhichismadethroughtheVREFSbitinthe ADCR1register.TheanaloginputvaluesmustnotbeallowedtoexceedthevalueofVREF. PE 0/ AN 0 PB 7/ AN 7 1. 25V VB GE N Bu ff er PE0 /V RE F VD D VR EF S V RE F 12 -b i t A DC Ba ndgap Re fe r enc e Vo lt ag e In put V ol ta g e AC S4 , A CS 2~ AC S0 A/D Input Structure |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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