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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F4M датащи(PDF) 87 Page - Holtek Semiconductor Inc |
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HT45F4M датащи(HTML) 87 Page - Holtek Semiconductor Inc |
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87 / 138 page  Rev. 1.10 86 �an�a�� 1�� �01� Rev. 1.10 87 �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP MCU A/D Converter Data Registers – ADRL, ADRH Asthedevicescontainaninternal12-bitA/Dconverter,theyrequiretwodataregisterstostorethe convertedvalue.Theseareahighbyteregister,knownasADRH,andalowbyteregister,known asADRL.Aftertheconversionprocesstakesplace,theseregisterscanbedirectlyreadbythe microcontrollertoobtainthedigitisedconversionvalue.Asonly12bitsofthe16-bitregisterspace isutilised,theformatinwhichthedataisstorediscontrolledbytheADRFSbitintheADCR0 registerasshownintheaccompanyingtable.D0~D11aretheA/Dconversionresultdatabits.Any unusedbitswillbereadaszero. ADRFS ADRH ADRL 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 0 D11 D10 D9 D8 D7 D6 D� D4 D� D� D1 D0 0 0 0 0 1 0 0 0 0 D11 D10 D9 D8 D7 D6 D� D4 D� D� D1 D0 A/D Data Registers A/D Converter Control Registers – ADCR0, ADCR1, ACERL TocontrolthefunctionandoperationoftheA/Dconverter,threecontrolregistersknownasADCR0, ADCR1andACERLareprovided.These8-bitregistersdefinefunctionssuchastheselectionof whichanalogchannelisconnectedtotheinternalA/Dconverter,thedigitiseddataformat,theA/ DclocksourceaswellascontrollingthestartfunctionandmonitoringtheA/Dconverterendof conversionstatus.TheACS3~ACS0bitsintheADCR0registerandACS4bitistheADCR1register definetheADCinputchannelnumber.Asthedevicecontainsonlyoneactualanalogtodigital converterhardwarecircuit,eachoftheindividual8analoginputsmustberoutedtotheconverter.It isthefunctionoftheACS4~ACS0bitstodeterminewhichanalogchannelinputsignalsorinternal 1.25VisactuallyconnectedtotheinternalA/Dconverter. TheACERLcontrolregistercontainstheACE7~ACE0bitswhichdeterminewhichpinsonPortA areusedasanaloginputsfortheA/DconverterinputandwhichpinsarenottobeusedastheA/D converterinput.SettingthecorrespondingbithighwillselecttheA/Dinputfunction,clearingthe bittozerowillselecteithertheI/Oorotherpin-sharedfunction.Whenthepinisselectedtobean A/Dinput,itsoriginalfunctionwhetheritisanI/Oorotherpin-sharedfunctionwillberemoved.In addition,anyinternalpull-highresistorsconnectedtothesepinswillbeautomaticallyremovedifthe pinisselectedtobeanA/Dinput. |
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