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HT66F20 Datasheet(PDF) 159 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 159 Page - Holtek Semiconductor Inc |
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159 / 298 page  Rev. 1.90 158 �e���a�� 18� �01� Rev. 1.90 159 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM Timer/Counter Mode Toselectthismode,bitsTnAM1,TnAM0andTnBM1,TnBM0intheTMnC1andTMnC2register shouldallbesethigh.TheTimer/CounterModeoperatesinanidenticalwaytotheCompare MatchOutputModegeneratingthesameinterruptflags.TheexceptionisthatintheTimer/Counter ModetheTMoutputpinisnotused.ThereforetheabovedescriptionandTimingDiagramsforthe CompareMatchOutputModecanbeusedtounderstanditsfunction.AstheTMoutputpinisnot usedinthismode,thepincanbeusedasanormalI/Opinorotherpin-sharedfunction. PWM Output Mode Toselectthismode,therequiredbitpairs,TnAM1,TnAM0andTnBM1,TnBM0shouldbeset to10respectivelyandalsotheTnAIO1,TnAIO0andTnBIO1,TnBIO0bitsshouldbesetto10 respectively.ThePWMfunctionwithintheTMisusefulforapplicationswhichrequirefunctions suchasmotorcontrol,heatingcontrol,illuminationcontroletc.Byprovidingasignaloffixed frequencybutofvaryingdutycycleontheTMoutputpin,asquarewaveACwaveformcanbe generatedwithvaryingequivalentDCRMSvalues. AsboththeperiodanddutycycleofthePWMwaveformcanbecontrolled,thechoiceofgenerated waveformisextremelyflexible.InthePWMmode,theTnCCLRbitisusedtodetermineinwhich waythePWMperiodiscontrolled.WiththeTnCCLRbitsethigh,thePWMperiodcanbefinely controlledusingtheCCRAregisters.InthiscasetheCCRBregistersareusedtosetthePWMduty value(forTPnBoutputpins).TheCCRPbitsarenotusedandTPnAoutputpinisnotused.The PWMoutputcanonlybegeneratedontheTPnBoutputpins.WiththeTnCCLRbitclearedtozero, thePWMperiodissetusingoneoftheeightvaluesofthethreeCCRPbits,inmultiplesof128. NowbothCCRAandCCRBregisterscanbeusedtosetupdifferentdutycyclevaluestoprovide dualPWMoutputsontheirrelativeTPnAandTPnBpins. TheTnPWM1andTnPWM0bitsdeterminethePWMalignmenttype,whichcanbeeitheredge orcentretype.Inedgealignment,theleadingedgeofthePWMsignalswillallbegenerated concurrentlywhenthecounterisresettozero.Withallpowercurrentsswitchingonatthesame time,thismaygiverisetoproblemsinhigherpowerapplications.Incentrealignmentthecentre ofthePWMactivesignalswilloccursequentially,thusreducingthelevelofsimultaneouspower switchingcurrents. Interruptflags,oneforeachoftheCCRA,CCRBandCCRP,willbegeneratedwhenacompare matchoccursfromeithertheComparatorA,ComparatorBorComparatorP.TheTnAOCand TnBOCbitsintheTMnC1andTMnC2registerareusedtoselecttherequiredpolarityofthePWM waveformwhilethetwoTnAIO1,TnAIO0andTnBIO1,TnBIO0bitspairsareusedtoenablethe PWMoutputortoforcetheTMoutputpintoafixedhighorlowlevel.TheTnAPOLandTnBPOL bitareusedtoreversethepolarityofthePWMoutputwaveform. |
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