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HT45F39 Datasheet(PDF) 55 Page - Holtek Semiconductor Inc |
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HT45F39 Datasheet(HTML) 55 Page - Holtek Semiconductor Inc |
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55 / 102 page  Rev. 1.10 54 July 01, 2016 Rev. 1.10 55 July 01, 2016 HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU HT45F39/HT45F391 Ultrasonic Distance Measurement 8-bit Flash MCU Timer/Counter Mode Toselectthismode,bitsTnM1andTnM0intheTMnC1registershouldbesetto11respectively. TheTimer/CounterModeoperatesinanidenticalwaytotheCompareMatchOutputMode generatingthesameinterruptflags.TheexceptionisthatintheTimer/CounterModetheTMoutput pinisnotused.ThereforetheabovedescriptionandTimingDiagramsfortheCompareMatch OutputModecanbeusedtounderstanditsfunction. PWM Output Mode Toselectthismode,bitsTnM1andTnM0intheTMnC1registershouldbesetto10respectively. ThePWMfunctionwithintheTMisusefulforapplicationswhichrequirefunctionssuchasmotor control,heatingcontrol,illuminationcontroletc.Byprovidingasignaloffixedfrequencybut ofvaryingdutycycleontheTMoutputpin,asquarewaveACwaveformcanbegeneratedwith varyingequivalentDCRMSvalues.AsboththeperiodanddutycycleofthePWMwaveform canbecontrolled,thechoiceofgeneratedwaveformisextremelyflexible.InthePWMmode,the TnCCLRbithasnoeffectonthePWMoperation.BothoftheCCRAandCCRPregistersareused togeneratethePWMwaveform,oneregisterisusedtocleartheinternalcounterandthuscontrol thePWMwaveformfrequency,whiletheotheroneisusedtocontrolthedutycycle.Whichregister isusedtocontroleitherfrequencyordutycycleisdeterminedusingtheTnDPXbitintheTMnC1 register.ThePWMwaveformfrequencyanddutycyclecanthereforebecontrolledbythevalues intheCCRAandCCRPregisters.Aninterruptflag,oneforeachoftheCCRAandCCRP,willbe generatedwhenacomparematchoccursfromeitherComparatorAorComparatorP.TheTnOCbit intheTMnC1registerisusedtoselecttherequiredpolarityofthePWMwaveformwhilethetwo TnIO1andTnIO0bitsareusedtoenablethePWMoutputortoforcetheTMoutputpintoafixed highorlowlevel.TheTnPOLbitisusedtoreversethepolarityofthePWMoutputwaveform. CTM, PWM Mode, Edge-aligned Mode, TnDPX=0 CCRP 001b 010b 011b 100b 101b 110b 111b 000b Period 128 256 384 512 640 768 896 1024 Duty CCRA IffSYS=16MHz,TMclocksourceselectfSYS/4,CCRP=100bandCCRA=128, TheCTMPWMoutputfrequency=(fSYS/4)/512=fSYS/2048=7.8125kHz,duty=128/512=25%. IftheDutyvaluedefinedbytheCCRAregisterisequaltoorgreaterthanthePeriodvalue,thenthe PWMoutputdutyis100%. CTM, PWM Mode, Edge-aligned Mode, TnDPX=1 CCRP 001b 010b 011b 100b 101b 110b 111b 000b Period CCRA Duty 128 256 384 512 640 768 896 1024 ThePWMoutputperiodisdeterminedbytheCCRAregistervaluetogetherwiththeTMclock whilethePWMdutycycleisdefinedbytheCCRPregistervalue. |
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