HT45F5R datasheet(85/138 Pages) HOLTEK

85 / 138 page

Rev. 1.10

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Rev. 1.10

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HT45F5R

Charger ASSP Flash MCU

HT45F5R

Charger ASSP Flash MCU

Timer/Counter Mode

Toselectthismode,bitsPTnM1andPTnM0inthePTMnC1registershouldbesetto11

respectively.TheTimer/CounterModeoperatesinanidenticalwaytotheCompareMatchOutput

Modegeneratingthesameinterruptflags.TheexceptionisthatintheTimer/CounterModethe

TMoutputpinisnotused.ThereforetheabovedescriptionandTimingDiagramsfortheCompare

MatchOutputModecanbeusedtounderstanditsfunction.AstheTMoutputpinisnotusedinthis

mode,thepincanbeusedasanormalI/Opinorotherpin-sharedfunction.

PWM Output Mode

Toselectthismode,bitsPTnM1andPTnM0inthePTMnC1registershouldbesetto10

respectively.ThePWMfunctionwithinthePTMnisusefulforapplicationswhichrequirefunctions

suchasmotorcontrol,heatingcontrol,illuminationcontroletc.Byprovidingasignaloffixed

frequencybutofvaryingdutycycleonthePTMnoutputpin,asquarewaveACwaveformcanbe

generatedwithvaryingequivalentDCRMSvalues.

AsboththeperiodanddutycycleofthePWMwaveformcanbecontrolled,thechoiceofgenerated

waveformisextremelyflexible.InthePWMOutputMode,thePTnCCLRbithasnoeffectonthe

PWMoperation.BothoftheCCRAandCCRPregistersareusedtogeneratethePWMwaveform,

oneregisterisusedtocleartheinternalcounterandthuscontrolthePWMwaveformfrequency,

whiletheotheroneisusedtocontrolthedutycycle.ThePWMwaveformfrequencyanddutycycle

canthereforebecontrolledbythevaluesintheCCRAandCCRPregisters.

Aninterruptflag,oneforeachoftheCCRAandCCRP,willbegeneratedwhenacomparematch

occursfromeitherComparatorAorComparatorP.ThePTnOCbitinthePTMnC1registerisused

toselecttherequiredpolarityofthePWMwaveformwhilethetwoPTnIO1andPTnIO0bitsare

usedtoenablethePWMoutputortoforcethePTMnoutputpintoafixedhighorlowlevel.The

PTnPOLbitisusedtoreversethepolarityofthePWMoutputwaveform.

• 10-bit PTMn, PWM Mode, Edge-aligned Mode

CCRP

1~1023

Pe�iod

1~10��

10�4

Duty

CCRA

IffSYS=8MHz,PTMnclocksourceselectfSYS/4,CCRP=512andCCRA=128,

ThePTMnPWMoutputfrequency=(fSYS/4)/512=fSYS/2048=3.906kHz,duty=128/(2×256)=25%.

IftheDutyvaluedefinedbytheCCRAregisterisequaltoorgreaterthanthePeriodvalue,thenthe

PWMoutputdutyis100%.

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