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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F4M 데이터시트(PDF) 92 Page - Holtek Semiconductor Inc |
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HT45F4M 데이터시트(HTML) 92 Page - Holtek Semiconductor Inc |
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92 / 138 page  Rev. 1.10 9� �an�a�� 1�� �01� Rev. 1.10 9� �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP MCU Controllingthepoweron/offfunctionoftheA/Dconvertercircuitryisimplementedusingthe ADOFFbitintheADCR0register.ThisbitmustbezerotopowerontheA/Dconverter.Whenthe ADOFFbitisclearedtozerotopowerontheA/Dconverterinternalcircuitryacertaindelay,as indicatedinthetimingdiagram,mustbeallowedbeforeanA/Dconversionisinitiated.Evenifno pinsareselectedforuseasA/DinputsbyclearingtheACE7~ACE0bitsintheACERLregisters,if theADOFFbitiszerothensomepowerwillstillbeconsumed.Inpowerconsciousapplicationsit isthereforerecommendedthattheADOFFissethightoreducepowerconsumptionwhentheA/D converterfunctionisnotbeingused. ThereferencevoltagesupplytotheA/DConvertercanbesuppliedfromeitherthepositivepowersupply pin,VDD,orfromanexternalreferencesourcessuppliedonpinVREF.Thedesiredselectionismade usingtheVREFSbit.AstheVREFpinispin-sharedwithotherfunctions,whentheVREFSbitisset high,theVREFpinfunctionwillbeselectedandtheotherpinfunctionswillbedisabledautomatically. A/D Input Pins AlloftheA/Danaloginputpinsarepin-sharedwiththeI/OpinsonPortAaswellasother functions.TheACE7~ACE0bitsintheACERLregisters,determinewhethertheinputpinsaresetup asA/Dconverteranaloginputsorwhethertheyhaveotherfunctions.IftheACE7~ACE0bitsforits correspondingpinissethighthenthepinwillbesetuptobeanA/Dconverterinputandtheoriginal pinfunctionsdisabled.Inthisway,pinscanbechangedunderprogramcontroltochangetheir functionbetweenA/Dinputsandotherfunctions.Allpull-highresistors,whicharesetupthrough registerprogramming,willbeautomaticallydisconnectedifthepinsaresetupasA/Dinputs.Note thatitisnotnecessarytofirstsetuptheA/DpinasaninputinthePACportcontrolregistertoenable theA/DinputaswhentheACE7~ACE0bitsenableanA/Dinput,thestatusoftheportcontrol registerwillbeoverridden. TheA/Dconverterhasitsownreferencevoltagepin,VREF,howeverthereferencevoltagecan alsobesuppliedfromthepowersupplypin,achoicewhichismadethroughtheVREFSbitinthe ADCR1register.TheanaloginputvaluesmustnotbeallowedtoexceedthevalueofVREF. PA 0/ AN 0 PA7 /A N7 1. 25V VB GE N Bu ff er PA1 /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 0 AN 8 A/D Input Structure |
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