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HT45F3W Datasheet(PDF) 105 Page - Holtek Semiconductor Inc |
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HT45F3W Datasheet(HTML) 105 Page - Holtek Semiconductor Inc |
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105 / 167 page  Rev. 1.50 104 De�e��e� 01� �01� Rev. 1.50 105 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter Flash MCU A/D Converter Control Registers – ADCR, ACSR, ANCSR TocontrolthefunctionandoperationoftheA/Dconverter,threecontrolregistersknownasADCR, ACSRandANCSRareprovided.These8-bitregistersdefinefunctionssuchastheselectionof whichanalogchannelisconnectedtotheinternalA/Dconverter,theA/Dclocksourceaswell ascontrollingthestartfunctionandmonitoringtheA/Dconverterendofconversionstatus.The ACS2~ACS0bitsintheADCRregisterdefinetheADCinputchannelnumber.Asthedevice containsonlyoneactualanalogtodigitalconverterhardwarecircuit,eachoftheindividual8analog inputsmustberoutedtotheconverter.ItisthefunctionoftheACS2~ACS0bitstodeterminewhich analogchannelinputpinisactuallyconnectedtotheinternalA/Dconverter. TheANCSRcontrolregistercontainsthePCR3~PCR0bitswhichdeterminewhichpinsonPortB areusedasanaloginputsfortheA/DconverterinputandwhichpinsarenottobeusedastheA/D converterinput.SettingthecorrespondingbithighwillselecttheA/Dinputfunction,clearingthe bittozerowillselecteithertheI/Oorotherpin-sharedfunction.Whenthepinisselectedtobean A/Dinput,itsoriginalfunctionwhetheritisanI/Oorotherpin-sharedfunctionwillberemoved.In addition,anyinternalpull-highresistorsconnectedtothesepinswillbeautomaticallyremovedifthe pinisselectedtobeanA/Dinput. ADCR Register Bit 7 6 5 4 3 2 1 0 Na�e START EOCB ADOFF — IDLE_CONV 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. Whentheconversionprocessisrunning,thebitwillbehigh. 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. Bit4 Unimplemented,readas“0” Bit3 IDLE_CONV:MCUhaltmode 0:disable 1:enable WhenMCUhaltmodeisenabled,ifADCconversionisinworking,theMCUwillenter haltmode.Andperipheralisnotaffected. |
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