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HT66F20 Datasheet(PDF) 121 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 121 Page - Holtek Semiconductor Inc |
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121 / 298 page  Rev. 1.90 1�0 �e���a�� 18� �01� Rev. 1.90 1�1 �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 PWM Output Mode Toselectthismode,bitsTnM1andTnM0intheTMnC1registershouldbesetto10respectively. ThePWMfunctionwithintheTMisusefulforapplicationswhichrequirefunctionssuchasmotor control,heatingcontrol,illuminationcontroletc.Byprovidingasignaloffixedfrequencybut ofvaryingdutycycleontheTMoutputpin,asquarewaveACwaveformcanbegeneratedwith varyingequivalentDCRMSvalues. AsboththeperiodanddutycycleofthePWMwaveformcanbecontrolled,thechoiceofgenerated waveformisextremelyflexible.InthePWMmode,theTnCCLRbithasnoeffectonthePWM operation.BothoftheCCRAandCCRPregistersareusedtogeneratethePWMwaveform,one registerisusedtocleartheinternalcounterandthuscontrolthePWMwaveformfrequency,while theotheroneisusedtocontrolthedutycycle.Whichregisterisusedtocontroleitherfrequency ordutycycleisdeterminedusingtheTnDPXbitintheTMnC1register.ThePWMwaveform frequencyanddutycyclecanthereforebecontrolledbythevaluesintheCCRAandCCRPregisters. Aninterruptflag,oneforeachoftheCCRAandCCRP,willbegeneratedwhenacomparematch occursfromeitherComparatorAorComparatorP.TheTnOCbitintheTMnC1registerisusedto selecttherequiredpolarityofthePWMwaveformwhilethetwoTnIO1andTnIO0bitsareusedto enablethePWMoutputortoforcetheTMoutputpintoafixedhighorlowlevel.TheTnPOLbitis usedtoreversethepolarityofthePWMoutputwaveform. CTM, PWM Mode, Edge-aligned Mode, TnDPX=0 CCRP 001b 010b 011b 100b 101b 110b 111b 000b Pe�iod 1�8 �56 �84 51� 640 768 896 10�4 D�t� CCRA IffSYS=16MHz,TMclocksourceisfSYS/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 Pe�iod CCRA D�t� 1�8 �56 �84 51� 640 768 896 10�4 ThePWMoutputperiodisdeterminedbytheCCRAregistervaluetogetherwiththeTMclockwhile thePWMdutycycleisdefinedbytheCCRPregistervalue. |
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