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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F5R датащи(PDF) 95 Page - Holtek Semiconductor Inc |
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HT45F5R датащи(HTML) 95 Page - Holtek Semiconductor Inc |
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95 / 138 page  Rev. 1.10 94 De�e��e� 1�� �01� Rev. 1.10 95 De�e��e� 1�� �01� HT45F5R Charger ASSP Flash MCU HT45F5R Charger ASSP Flash MCU Controllingthepoweron/offfunctionoftheA/Dconvertercircuitryisimplementedusingthe ADCENbitintheSADC0register.ThisbitmustbesethightopowerontheA/Dconverter.When theADCENbitissethightopowerontheA/Dconverterinternalcircuitryacertaindelay,as indicatedinthetimingdiagram,mustbeallowedbeforeanA/Dconversionisinitiated.Evenif nopinsareselectedforuseasA/Dinputs,iftheADCENbitishigh,thensomepowerwillstillbe consumed.InpowerconsciousapplicationsitisthereforerecommendedthattheADCENissetlow toreducepowerconsumptionwhentheA/Dconverterfunctionisnotbeingused. A/D Converter Reference Voltage ThereferencevoltagesupplytotheA/Dconvertercanbesuppliedfromthepositivepowersupply pin,AVDD,orfromanexternalreferencesourcesuppliedonpinVREF.Thedesiredselectionis madeusingtheSAVRS1andSAVRS0bits.WhentheSAVRSbitfieldissetto"01",theA/Dconverter referencevoltagewillsimultaneouslycomefromtheAVDDpinandVREFpin.Otherwise,ifthe SAVRSbitfieldissettoanyothervalueexcept"01",theA/Dconverterreferencevoltagewillcome fromtheVREFpin.AstheA/DconverterandUSBAutoDetectorD/Aconverterexternalreference voltagecomefromthesameVREFpin,whentheVREFpinisselectedastheA/Dconverter referencevoltagesupplypin,theUSBAutoDetectorD/Aconverterreferencevoltageselectionbit DACVRSbitfieldshouldbealsoproperlyconfiguredexceptthepin-sharedfunctioncontrolbitsto avoidfunctionalabnormity.However,iftheinternalA/Dconverterpowerisselectedasthereference voltage,theVREFpinmustnotbeconfiguredasthereferencevoltageinputfunctionfortheA/D convertertoavoidtheinternalconnectionbetweentheVREFpintoA/DconverterpowerAVDD.The analoginputvaluesmustnotbeallowedtoexceedthevalueoftheselectedreferencevoltage,AVDD orVREF. ThefollowingtableshowshowtoproperlyselectreferencevoltagefortheA/DconverterorUSB AutoDetectorD/Aconverter. A/D Converter Reference Voltage Selection USB Auto Detector Reference Voltage Selection SAVRS[1:0] DACVRS[1:0] PAS01~PAS00 AVDD AVDD 01 00 Othe�s ex�ept "11" AVDD VREF 01 01�10 10 VREF AVDD Othe�s ex�ept "01" 00 11 VREF VREF Othe�s ex�ept "01" 01�10 11 A/D Converter Input Signals AlltheexternalA/Danalogchannelinputpinsarepin-sharedwiththeI/Opinsaswellasother functions.ThecorrespondingcontrolbitsforeachA/DexternalinputpininthePAS0andPAS1 registerdeterminewhethertheinputpinsaresetupasA/Dconverteranaloginputsorwhether theyhaveotherfunctions.IfthepinissetuptobeasanA/Danalogchannelinput,theoriginalpin functionswillbedisabled.Inthisway,pinscanbechangedunderprogramcontroltochangetheir functionbetweenA/Dinputsandotherfunctions.Allpullhighresistors,whicharesetupthrough registerprogramming,willbeautomaticallydisconnectedifthepinsaresetupasA/Dinputs.Note thatitisnotnecessarytofirstsetuptheA/Dpinasaninputintheportcontrolregistertoenablethe A/Dinputaswhenthepin-sharedfunctioncontrolbitsenableanA/Dinput,thestatusoftheport controlregisterwillbeoverridden. TherearefourinternalanalogsignalsderivedfromtheBandgapreferencevoltageVBG,10×IS,and USBD+/D-internaldividerregistersoutputvoltageVDPVDO/VDNVDO,whichcanbeconnectedtothe A/DconverterastheanaloginputsignalbyconfiguringtheSAINS2~SAINS0bits.Iftheexternal channelinputisselectedtobeconverted,theSAINS2~SAINS0bitsshouldbesetto"000"andthe |
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