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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT67F488 датащи(PDF) 98 Page - Holtek Semiconductor Inc |
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HT67F488 датащи(HTML) 98 Page - Holtek Semiconductor Inc |
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98 / 171 page  Rev. 1.60 98 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM fSYS A/D Clock Period (tADCK) ADCK2, ADCK1, ADCK0 =000 (fSYS) ADCK2, ADCK1, ADCK0 =001 (fSYS/2) ADCK2, ADCK1, ADCK0 =010 (fSYS/4) ADCK2, ADCK1, ADCK0 =011 (fSYS/8) ADCK2, ADCK1, ADCK0 =100 (fSYS/16) ADCK2, ADCK1, ADCK0 =101 (fSYS/32) ADCK2, ADCK1, ADCK0 =110 (fSYS/64) ADCK2, ADCK1, ADCK0 =111 1MHz 1μs 2μs 4μs 8μs 16μs* 32μs* 64μs* Undefined �MHz 500ns 1μs 2μs 4μs 8μs 16μs* 32μs* Undefined 4MHz 250ns* 500ns 1μs 2μs 4μs 8μs 16μs* Undefined 8MHz 125ns* 250ns* 500ns 1μs 2μs 4μs 8μs Undefined A/D Clock Period Examples Controllingthepoweron/offfunctionoftheA/Dconvertercircuitryisimplementedusingthe ADOFFbitintheADCR0register.ThisbitmustbezerotopowerontheA/Dconverter.Whenthe ADOFFbitisclearedtozerotopowerontheA/Dconverterinternalcircuitryacertaindelay,as indicatedinthetimingdiagram,mustbeallowedbeforeanA/Dconversionisinitiated.Evenifno pinsareselectedforuseasA/DinputsbyclearingtheACE9~ACE0bitsintheACERHandACERL registers,iftheADOFFbitiszerothensomepowerwillstillbeconsumed.Inpowerconscious applicationsitisthereforerecommendedthattheADOFFissethightoreducepowerconsumption whentheA/Dconverterfunctionisnotbeingused. ThereferencevoltagesupplytotheA/DConvertercanbesuppliedfromeitherthepositivepower supplypin,VDD,orfromanexternalreferencesourcessuppliedonpinVREF.Thedesiredselection ismadeusingtheVREFSbit.AstheVREFpinispin-sharedwithotherfunctions,whentheVREFS bitissethigh,theVREFpinfunctionwillbeselectedandtheotherpinfunctionswillbedisabled automatically. A/D Input Pins AlloftheA/Danaloginputpinsarepin-sharedwiththePBandPEI/Opinsaswellasother functions.TheACE9~ACE0bitsintheACERHandACERLregisters,determinewhetherthe inputpinsaresetupasA/Dconverteranaloginputsorwhethertheyhaveotherfunctions.Ifthe ACE9~ACE0bitsforitscorrespondingpinissethighthenthepinswillbesetuptobeanA/D converterinputandtheoriginalpinfunctionsdisabled.Inthisway,pinscanbechangedunder programcontroltochangetheirfunctionbetweenA/Dinputsandotherfunctions.Allpull-high resistors,whicharesetupthroughregisterprogramming,willbeautomaticallydisconnectedifthe pinsaresetupasA/Dinputs.NotethatitisnotnecessarytofirstsetuptheA/Dpinasaninputinthe PBCorPECportcontrolregistertoenabletheA/DinputaswhentheACE9~ACE0bitsenablean A/Dinput,thestatusoftheportcontrolregisterwillbeoverridden. TheA/Dconverterhasitsownreferencevoltagepin,VREF,howeverthereferencevoltagecan alsobesuppliedfromthepowersupplypin,achoicewhichismadethroughtheVREFSbitinthe ADCR1register.TheanaloginputvaluesmustnotbeallowedtoexceedthevalueofVREF. |
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