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HT46R003B Folha de dados(PDF) 48 Page - Holtek Semiconductor Inc |
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HT46R003B Folha de dados(HTML) 48 Page - Holtek Semiconductor Inc |
48 / 76 page Rev. 1.00 �8 ��ne 1�� �01� Rev. 1.00 �� ��ne 1�� �01� HT46R003B Cost-Effective A/D 8-bit OTP MCU HT46R003B Cost-Effective A/D 8-bit OTP MCU A/D Operation TheSTARTbitintheregisterisusedtostartandresettheA/Dconverter.Whenthemicrocontroller setsthisbitfromlowtohighandthenlowagain,ananalogtodigitalconversioncyclewillbe initiated.WhentheSTARTbitisbroughtfromlowtohighbutnotlowagain,theEOCBbitinthe ADCRregisterwillbesettoa“1”andtheanalogtodigitalconverterwillbereset.ItistheSTART bitthatisusedtocontroltheoverallstartoperationoftheinternalanalogtodigitalconverter. TheEOCBbitintheADCRregisterisusedtoindicatewhentheanalogtodigitalconversionprocess iscomplete.Thisbitwillbeautomaticallysetto“0”bythemicrocontrollerafteraconversioncycle hasended.Inaddition,thecorrespondingA/Dinterruptrequestflagwillbesetintheinterrupt controlregister,andiftheinterruptsareenabled,anappropriateinternalinterruptsignalwillbe generated.ThisA/DinternalinterruptsignalwilldirecttheprogramflowtotheassociatedA/D internalinterruptaddressforprocessing.IftheA/Dinternalinterruptisdisabled,themicrocontroller canbeusedtopolltheEOCBbitintheADCRregistertocheckwhetherithasbeenclearedasan alternativemethodofdetectingtheendofanA/Dconversioncycle. TheclocksourcefortheA/Dconverter,whichoriginatesfromthesystemclockfSYS,isfirstdivided byadivisionratio,thevalueofwhichisdeterminedbytheADCS2,ADCS1andADCS0bitsinthe ACSRregister. TheA/Dconverteroverallon/offcontrolisafunctionofboththeADONBbitintheACSRregister andthePCR4~PCR0bitsintheADPCRregisterasshowninthetable.EithertheADONBbit clearedtozeroorthePCR4~PCR0bitssettoazerovaluewillswitchofftheA/Dconverter.These areimportantconsiderationinpowersensitiveapplicationsandmustbetakenintoaccountifpower consumptionistobeminimised.Asthetableillustrates,executionoftheHALTinstructionhasno effectontheA/Dconverteron/offcontrolandsubsequentlyitspowerconsumption. PCR4~PCR0 Bits HALT Instruction ADONB Bit A/D Converter On/Off = 0 x x Off > 0 x 0 On > 0 x 1 Off “x”: Don’t care A/D Converter On/Off Control AlthoughtheA/DclocksourceisdeterminedbythesystemclockfSYS,andbybitsADCS2,ADCS1 andADCS0,therearesomelimitationsonthemaximumA/Dclocksourcespeedthatcanbe selected.AstheminimumvalueofpermissibleA/Dclockperiod,tAD,is0.5μs~10μs,caremustbe takenforsystemclockspeedsinexcessof4MHz.Forsystemclockspeedsinexcessof4MHz,the ADCS2,ADCS1andADCS0bitsshouldnotbesetto“000”.DoingsowillgiveA/Dclockperiods thatarelessthantheminimumA/DclockperiodwhichmayresultininaccurateA/Dconversion values. Refertothefollowingtableforexamples,wherevaluesmarkedwithanasterisk*showwhere, dependinguponthedevice,specialcaremustbetaken,asthevaluesmaybelessthanthespecified minimumA/DClockPeriod. |
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