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HT45R4U датащи(PDF) 49 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 49 Page - Holtek Semiconductor Inc |
49 / 105 page Rev. 1.10 48 �a��� 1�� �01� Rev. 1.10 49 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD A/D Converter Control Register – ADCR0, ADCR1, ACER TocontrolthefunctionandoperationoftheA/Dconverter,twocontrolregistersknownasADCR0 andADCR1areprovided.These8-bitregistersdefinefunctionssuchastheselectionofwhich analogchannelisconnectedtotheinternalA/Dconverter,whichpinsareusedasanaloginputsand whichareusedasnormalI/Os,theA/Dclocksourceaswellascontrollingthestartfunctionand monitoringtheA/Dconverterendofconversionstatus. TheACS2~ACS0bitsintheADCR0registerandACS4bitistheADCR1registerdefinetheADC inputchannelnumber.Asthedevicecontainsonlyoneactualanalogtodigitalconverterhardware circuit,eachoftheindividual8analoginputsmustberoutedtotheconverter.Itisthefunctionof theACS4andACS2~ACS0bitstodeterminewhichanalogchannelinputpinsorinternal1.25Vis actuallyconnectedtotheinternalA/Dconverter. TheACERcontrolregistercontainstheACER7~ACER0bitswhichdeterminewhichpinsonPE0, PA6andPB2~PB7areusedasanaloginputsfortheA/Dconverterinputandwhichpinsarenot tobeusedastheA/Dconverterinput.SettingthecorrespondingbithighwillselecttheA/Dinput function,clearingthebittozerowillselecteithertheI/Oorotherpin-sharedfunction.Whenthe pinisselectedtobeanA/Dinput,itsoriginalfunctionwhetheritisanI/Oorotherpin-shared functionwillberemoved.Inaddition,anyinternalpull-highresistorsconnectedtothesepinswillbe automaticallyremovedifthepinisselectedtobeanA/Dinput. ADCR0 Register Bit 7 6 5 4 3 2 1 0 Name START EOCB ADOFF ACS4 — ACS� ACS1 ACS0 R/W R/W R R/W R/W — R/W R/W R/W POR 0 1 1 0 — 0 0 0 Bit7 START:StarttheA/Dconversion 0→1→0 :start 0→1 :resettheA/DconverterandsetEOCBto"1" ThisbitisusedtoinitiateanA/Dconversionprocess.Thebitisnormallylowbutifset highandthenclearedlowagain,theA/Dconverterwillinitiateaconversionprocess. WhenthebitissethightheA/Dconverterwillbereset. Bit6 EOCB:EndofA/Dconversionflag 0:A/Dconversionended 1:A/Dconversioninprogress ThisreadonlyflagisusedtoindicatewhenanA/Dconversionprocesshascompleted. Whentheconversionprocessisrunningthebitwillbehigh. Bit5 ADOFF:ADCmodulepoweron/offcontrolbit 0:ADCmodulepoweron 1:ADCmodulepoweroff ThisbitcontrolsthepowertotheA/Dinternalfunction.Thisbitshouldbecleared tozerotoenabletheA/Dconverter.IfthebitissethighthentheA/Dconverterwill beswitchedoffreducingthedevicepowerconsumption.AstheA/Dconverterwill consumealimitedamountofpower,evenwhennotexecutingaconversion,thismay beanimportantconsiderationinpowersensitivebatterypoweredapplications. Note:1.itisrecommendedtosetADOFF=1beforeenteringIDLE/SLEEPModefor savingpower. 2.ADOFF=1willpowerdowntheADCmodule. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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