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HT66F0176 Datasheet(PDF) 77 Page - Holtek Semiconductor Inc |
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HT66F0176 Datasheet(HTML) 77 Page - Holtek Semiconductor Inc |
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77 / 165 page  Rev. 1.20 �6 ����st 2�� 201� Rev. 1.20 �� ����st 2�� 201� HT66F0176 A/D Flash MCU with EEPROM HT66F0176 A/D Flash MCU with EEPROM Timer/Counter Mode Toselectthismode,bitsTnM1andTnM0intheTMnC1registershouldbesetto11respectively. TheTimer/CounterModeoperatesinanidenticalwaytotheCompareMatchOutputMode generatingthesameinterruptflags.TheexceptionisthatintheTimer/CounterModetheTMnoutput pinisnotused.ThereforetheabovedescriptionandTimingDiagramsfortheCompareMatch OutputModecanbeusedtounderstanditsfunction.AstheTMnoutputpinisnotusedinthismode, thepincanbeusedasanormalI/Opinorotherpin-sharedfunction. PWM Output Mode Toselectthismode,bitsTnM1andTnM0intheTMnC1registershouldbesetto10respectively andalsotheTnIO1andTnIO0bitsshouldbesetto10respectively.ThePWMfunctionwithin theTMnisusefulforapplicationswhichrequirefunctionssuchasmotorcontrol,heatingcontrol, illuminationcontrol,etc.Byprovidingasignaloffixedfrequencybutofvaryingdutycycleonthe TMnoutputpin,asquarewaveACwaveformcanbegeneratedwithvaryingequivalentDCRMS values. AsboththeperiodanddutycycleofthePWMwaveformcanbecontrolled,thechoiceofgenerated waveformisextremelyflexible.InthePWMmode,theTnCCLRbithasnoeffectasthePWM period.BothoftheCCRPandCCRAregistersareusedtogeneratethePWMwaveform,oneregister isusedtocleartheinternalcounterandthuscontrolthePWMwaveformfrequency,whiletheother oneisusedtocontrolthedutycycle.ThePWMwaveformfrequencyanddutycyclecantherefore becontrolledbythevaluesintheCCRAandCCRPregisters. Aninterruptflag,oneforeachoftheCCRAandCCRP,willbegeneratedwhenacomparematch occursfromeitherComparatorAorComparatorP.TheTnOCbitintheTMnC1registerisusedto selecttherequiredpolarityofthePWMwaveformwhilethetwoTnIO1andTnIO0bitsareusedto enablethePWMoutputortoforcetheTMnoutputpintoafixedhighorlowlevel.TheTnPOLbit isusedtoreversethepolarityofthePWMoutputwaveform. • 10-bit PTM, PWM Mode CCRP 1~1023 0 Period 1~1023 1024 D�ty CCR� IffSYS=16MHz,TMclocksourceselectfSYS/4,CCRP=512andCCRA=128, TheTMnPWMoutputfrequency=(fSYS/4)/512=fSYS/2048=7.8125kHz,duty=128/512=25%, IftheDutyvaluedefinedbytheCCRAregisterisequaltoorgreaterthanthePeriodvalue,thenthe PWMoutputdutyis100%. |
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