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HT45FM2C bảng dữ liệu(PDF) 81 Page - Holtek Semiconductor Inc |
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HT45FM2C bảng dữ liệu(HTML) 81 Page - Holtek Semiconductor Inc |
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81 / 171 page  Rev. 1.10 80 �a� �0� �01� Rev. 1.10 81 �a� �0� �01� HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU Preliminar� CAPTMCH Register Bit 7 6 5 4 3 2 1 0 Name D15 D14 D1� D1� D11 D10 D9 D8 R/W R R R R R R R R POR x x x x x x x x "x"unknown Bit 7~0 CAPTMCH: CAPTMCaptureHighByteRegisterbit7~bit0 CAPTM16-bitCaptureRegisterbit15~bit8. Capture Timer Operation TheCaptureTimerisusedtodetectandmeasureinputsignalpulsewidthsandaperiods.Itcanbe usedinbothaCaptureorCompareMode.ThetimerinputsarethethreecaptureinputsINT0A, INT0BandINT0C.Eachofthesecaptureinputshasitsownedgedetectorselection,tochoose betweenhigh,loworbothedgetriggertypes. TheCAPTONbitisusedtocontroltheoverallCaptureTimerenable/disablefunction.Disablingthe CaptureModulewhennotusedwillreducethedevicepowerconsumption.Additionallythecapture inputcontrolisenabled/disabledusingtheCAPENcontrolbit.Thetriggeredgeoptionaresetup usingtheCAPEG1andCAPEG0bits,toselecteitherpositiveedge,negativeedgeorbothedges. Capture Mode Operation Thecapturetimermodulecontains2captureregisters,CAPTMCLandCAPTMCH,whichareused tostorethepresentvalueinthecounter.WhentheCaptureModuleisenabled,theneachtimean externalpinreceivesavalidtriggersignal,thecontentofthefreerunning16-bitcounter,whichis containedintheCAPTMDLandCAPTMDHregisters,willbecapturedintothecaptureregisters, CAPTMCLandCAPTMCH.Whenthisoccurs,theCAPOFinterruptflagbitintheinterrupt controlregisterwillbeset.Ifthisinterruptisenabledbysettingtheinterruptenablebit,CAPOE, high,aninterruptwillbegenerated.IftheCAPCLRbitissethigh,thenthe16-bitcounterwillbe automaticallyresetafteracaptureeventoccurs. Compare Mode Operation Whenthetimerisusedinthecomparemode,theCAPTMALandCAPTMAHregistersareusedto storethe16-bitcomparevalue.Whenthefreerunningvalueofthecount-up16-bitcounterreaches avalueequaltotheprogrammedvaluesinthesecompareregisters,theCAPCFinterruptflagwill besetwhichwillgenerateaninterruptifitsrelatedinterruptenablebitisset.IftheCAMCLRbit issethigh,thenthecounterwillberesettozeroautomaticallywhenacomparematchcondition occurs.Therotorspeedorastalledmotorconditioncanbedetectedbysettingthecompareregisters tocomparethecapturedsignaledgetransitiontime.Ifarotorstallconditionoccurs,thenacompare interruptwillbegenerated,afterwhichthePWMmotordrivecircuitcanbeshutdowntopreventa motorburnoutsituation. Noise Filter ThetimeralsoincludesanoiseFilterwhichisusedtofilteroutunwantedglitchesorpulsesonthe triggerinputpins.ThisfunctionisenabledusingtheCAPFILbit.Ifthenoisefilterisenabled,the captureinputsignalsmustbesampledeither2or4times,inordertorecognizeanedgeasavalid captureevent.Thesampling2or4timeunitsarebasedoeithertSYSor4×tSYSdeterminedusingthe CAPNFSbit. |
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