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HT67F5652 Datasheet(PDF) 98 Page - Holtek Semiconductor Inc |
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HT67F5652 Datasheet(HTML) 98 Page - Holtek Semiconductor Inc |
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98 / 224 page  Rev. 1.00 98 De�e��e� 0�� �01� Rev. 1.00 99 De�e��e� 0�� �01� HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU Timer/Counter Mode Toselectthismode,bitsTnM1andTnM0inthePTMnC1registershouldallbesetto11 respectively.TheTimer/CounterModeoperatesinanidenticalwaytotheCompareMatchOutput Modegeneratingthesameinterruptflags.TheexceptionisthatintheTimer/CounterModethe TMoutputpinisnotused.ThereforetheabovedescriptionandTimingDiagramsfortheCompare MatchOutputModecanbeusedtounderstanditsfunction.AstheTMoutputpinisnotusedinthis mode,thepincanbeusedasanormalI/Opinorotherpin-sharedfunction. PWM Output Mode Toselectthismode,bitsTnM1andTnM0inthePTMnC1registershouldbesetto10respectively andalsotheTnIO1andTnIO0bitsshouldbesetto10respectively.ThePWMfunctionwithin theTMisusefulforapplicationswhichrequirefunctionssuchasmotorcontrol,heatingcontrol, illuminationcontroletc.Byprovidingasignaloffixedfrequencybutofvaryingdutycycleonthe TMoutputpin,asquarewaveACwaveformcanbegeneratedwithvaryingequivalentDCRMS values. AsboththeperiodanddutycycleofthePWMwaveformcanbecontrolled,thechoiceofgenerated waveformisextremelyflexible.InthePWMOutputMode,theTnCCLRbithasnoeffectasthe PWMperiod.BothoftheCCRPandCCRAregistersareusedtogeneratethePWMwaveform,one registerisusedtocleartheinternalcounterandthuscontrolthePWMwaveformfrequency,while theotheroneisusedtocontrolthedutycycle.ThePWMwaveformfrequencyanddutycyclecan thereforebecontrolledbythevaluesintheCCRAandCCRPregisters. Aninterruptflag,oneforeachoftheCCRAandCCRP,willbegeneratedwhenacomparematch occursfromeitherComparatorAorComparatorP.TheTnOCbitinthePTMnC1registerisusedto selecttherequiredpolarityofthePWMwaveformwhilethetwoTnIO1andTnIO0bitsareusedto enablethePWMoutputortoforcetheTMoutputpintoafixedhighorlowlevel.TheTnPOLbitis usedtoreversethepolarityofthePWMoutputwaveform. 10-bit PTM, PWM Output Mode CCRP 0 1~1023 Pe�iod 10�4 1~10�3 Duty CCRA IffSYS=16MHz,TMclocksourceselectfSYS/4,CCRP=512andCCRA=128, ThePTMPWMoutputfrequency=(fSYS/4)/512=fSYS/2048=7.8125kHz,duty=128/512=25%, IftheDutyvaluedefinedbytheCCRAregisterisequaltoorgreaterthanthePeriodvalue,thenthe PWMoutputdutyis100%. |
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