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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F4MA 데이터시트(PDF) 87 Page - Holtek Semiconductor Inc |
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HT45F4MA 데이터시트(HTML) 87 Page - Holtek Semiconductor Inc |
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87 / 145 page  Rev. 1.20 8� De�e��e� 1�� 201� Rev. 1.20 87 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU Timer/Counter Mode Toselectthismode,bitsT1M1andT1M0intheTM1C1registershouldbesetto11respectively. TheTimer/CounterModeoperatesinanidenticalwaytotheCompareMatchOutputMode generatingthesameinterruptflags.TheexceptionisthatintheTimer/CounterModetheTMoutput pinisnotused.ThereforetheabovedescriptionandTimingDiagramsfortheCompareMatch OutputModecanbeusedtounderstanditsfunction.AstheTMoutputpinisnotusedinthismode, thepincanbeusedasanormalI/Opinorotherpin-sharedfunction. PWM Output Mode Toselectthismode,bitsT1M1andT1M0intheTM1C1registershouldbesetto10respectively andalsotheT1IO1andT1IO0bitsshouldbesetto10respectively.ThePWMfunctionwithin theTMisusefulforapplicationswhichrequirefunctionssuchasmotorcontrol,heatingcontrol, illuminationcontrol,etc.Byprovidingasignaloffixedfrequencybutofvaryingdutycycleonthe TMoutputpin,asquarewaveACwaveformcanbegeneratedwithvaryingequivalentDCRMS values. AsboththeperiodanddutycycleofthePWMwaveformcanbecontrolled,thechoiceofgenerated waveformisextremelyflexible.InthePWMmode,theT1CCLRbithasnoeffectasthePWM period.BothoftheCCRPandCCRAregistersareusedtogeneratethePWMwaveform,oneregister isusedtocleartheinternalcounterandthuscontrolthePWMwaveformfrequency,whiletheother oneisusedtocontrolthedutycycle.ThePWMwaveformfrequencyanddutycyclecantherefore becontrolledbythevaluesintheCCRAandCCRPregisters. Aninterruptflag,oneforeachoftheCCRAandCCRP,willbegeneratedwhenacomparematch occursfromeitherComparatorAorComparatorP.TheT1OCbitintheTM1C1registerisusedto selecttherequiredpolarityofthePWMwaveformwhilethetwoT1IO1andT1IO0bitsareusedto enablethePWMoutputortoforcetheTMoutputpintoafixedhighorlowlevel.TheT1POLbitis usedtoreversethepolarityofthePWMoutputwaveform. • 10-bit PTM, PWM Mode Period Duty CCRP CCRA IffSYS=7.5MHz,TMclocksourceselectfH,CCRP=100andCCRA=40, ThePTMPWMoutputfrequency=fH/100=300kHz,duty=40/100=40%, IftheDutyvaluedefinedbytheCCRAregisterisequaltoorgreaterthanthePeriodvalue,thenthe PWMoutputdutyis100%. |
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