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HT66F019 Datasheet(PDF) 67 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 67 Page - Holtek Semiconductor Inc |
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67 / 175 page  Rev. 1.00 66 De�e��e� 01� �01� Rev. 1.00 6� De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM Bit5~4 CTIO1~CTIO0:SelectCTMfunction CompareMatchOutputMode 00:Nochange 01:Outputlow 10:Outputhigh 11:Toggleoutput PWMOutputMode 00:PWMoutputinactivestate 01:PWMoutputactivestate 10:PWMoutput 11:Undefined Timer/CounterMode Unused ThesetwobitsareusedtodeterminehowtheCTMoutputpinchangesstatewhena certainconditionisreached.Thefunctionthatthesebitsselectdependsuponinwhich modetheCTMisrunning. IntheCompareMatchOutputMode,theCTIO1andCTIO0bitsdeterminehowthe CTMoutputpinchangesstatewhenacomparematchoccursfromtheComparatorA. TheCTMoutputpincanbesetuptoswitchhigh,switchlowortotoggleitspresent statewhenacomparematchoccursfromtheComparatorA.Whenthebitsareboth zero,thennochangewilltakeplaceontheoutput.TheinitialvalueoftheCTMoutput pinshouldbesetupusingtheCTOCbitintheCTMC1register.Notethattheoutput levelrequestedbytheCTIO1andCTIO0bitsmustbedifferentfromtheinitialvalue setupusingtheCTOCbitotherwisenochangewilloccurontheCTMoutputpinwhen acomparematchoccurs.AftertheCTMoutputpinchangesstate,itcanberesettoits initiallevelbychangingtheleveloftheCTONbitfromlowtohigh. InthePWMOutputMode,theCTIO1andCTIO0bitsdeterminehowtheCTM outputpinchangesstatewhenacertaincomparematchconditionoccurs.ThePWM outputfunctionismodifiedbychangingthesetwobits.Itisnecessarytoonlychange thevaluesoftheCTIO1andCTIO0bitsonlyaftertheCTMhasbeenswitchedoff. UnpredictablePWMoutputswilloccuriftheCTIO1andCTIO0bitsarechanged whentheCTMisrunning. Bit3 CTOC:CTPOutputcontrol CompareMatchOutputMode 0:Initiallow 1:Initialhigh PWMOutputMode 0:Activelow 1:Activehigh ThisistheoutputcontrolbitfortheCTMoutputpin.Itsoperationdependsupon whetherCTMisbeingusedintheCompareMatchOutputModeorinthePWM OutputMode.IthasnoeffectiftheCTMisintheTimer/CounterMode.Inthe CompareMatchOutputModeitdeterminesthelogicleveloftheCTMoutputpin beforeacomparematchoccurs.InthePWMOutputModeitdeterminesifthePWM signalisactivehighoractivelow. Bit2 CTPOL:CTPOutputpolaritycontrol 0:Non-invert 1:Invert ThisbitcontrolsthepolarityoftheCTPoutputpin.WhenthebitissethightheCTM outputpinwillbeinvertedandnotinvertedwhenthebitiszero.Ithasnoeffectifthe TMisintheTimer/CounterMode. Bit1 CTDPX:CTMPWMduty/periodcontrol 0:CCRP–period;CCRA–duty 1:CCRP–duty;CCRA–period ThisbitdetermineswhichoftheCCRAandCCRPregistersareusedforperiodand dutycontrolofthePWMwaveform. |
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