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HT45F77 Datasheet(PDF) 80 Page - Holtek Semiconductor Inc |
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HT45F77 Datasheet(HTML) 80 Page - Holtek Semiconductor Inc |
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80 / 203 page  Rev. 1.20 80 De�e��e� 1�� 201� Rev. 1.20 81 De�e��e� 1�� 201� HT45F77 Body Fat Scale Flash MCU HT45F77 Body Fat Scale Flash MCU Timer/CounterMode Unused ThesetwobitsareusedtodeterminehowtheTMoutputpinchangesstatewhena certainconditionisreached.Thefunctionthatthesebitsselectdependsuponinwhich modetheTMisrunning. IntheCompareMatchOutputMode,theTnIO1andTnIO0bitsdeterminehowthe TMoutputpinchangesstatewhenacomparematchoccursfromtheComparatorA. TheTMoutputpincanbesetuptoswitchhigh,switchlowortotoggleitspresent statewhenacomparematchoccursfromtheComparatorA.Whenthebitsareboth zero,thennochangewilltakeplaceontheoutput.TheinitialvalueoftheTMoutput pinshouldbesetupusingtheTnOCbitintheTMnC1register.Notethattheoutput levelrequestedbytheTnIO1andTnIO0bitsmustbedifferentfromtheinitialvalue setupusingtheTnOCbitotherwisenochangewilloccurontheTMoutputpinwhen acomparematchoccurs.AftertheTMoutputpinchangesstate,itcanberesettoits initiallevelbychangingtheleveloftheTnONbitfromlowtohigh. InthePWMMode,theTnIO1andTnIO0bitsdeterminehowtheTMoutputpin changesstatewhenacertaincomparematchconditionoccurs.ThePWMoutput functionismodifiedbychangingthesetwobits.Itisnecessarytoonlychangethe valuesoftheTnIO1andTnIO0bitsonlyaftertheTMnhasbeenswitchedoff. UnpredictablePWMoutputswilloccuriftheTnIO1andTnIO0bitsarechangedwhen theTMisrunning. Bit3 TnOC:TPn_0,TPn_1Outputcontrolbit CompareMatchOutputMode 0:Initiallow 1:Initialhigh PWMMode 0:Activelow 1:Activehigh ThisistheoutputcontrolbitfortheTMoutputpin.Itsoperationdependsuponwhether TMisbeingusedintheCompareMatchOutputModeorinthePWMMode.Ithasno effectiftheTMisintheTimer/CounterMode.IntheCompareMatchOutputModeit determinesthelogicleveloftheTMoutputpinbeforeacomparematchoccurs.Inthe PWMModeitdeterminesifthePWMsignalisactivehighoractivelow. Bit2 TnPOL:TPn_0,TPn_1OutputpolarityControl 0:Non-invert 1:Invert ThisbitcontrolsthepolarityoftheTPn_0orTPn_1outputpin.Whenthebitisset hightheTMoutputpinwillbeinvertedandnotinvertedwhenthebitiszero.Ithasno effectiftheTMisintheTimer/CounterMode. Bit1 TnDPX:TMnPWMperiod/dutyControl 0:CCRP-period;CCRA-duty 1:CCRP-duty;CCRA-period Thisbit,determineswhichoftheCCRAandCCRPregistersareusedforperiodand dutycontrolofthePWMwaveform. Bit0 TnCCLR:SelectTMnCounterclearcondition 0:TMnComparatrorPmatch 1:TMnComparatrorAmatch Thisbitisusedtoselectthemethodwhichclearsthecounter.Rememberthatthe CompactTMcontainstwocomparators,ComparatorAandComparatorP,eitherof whichcanbeselectedtocleartheinternalcounter.WiththeTnCCLRbitsethigh, thecounterwillbeclearedwhenacomparematchoccursfromtheComparatorA. Whenthebitislow,thecounterwillbeclearedwhenacomparematchoccursfrom theComparatorPorwithacounteroverflow.Acounteroverflowclearingmethodcan onlybeimplementediftheCCRPbitsareallclearedtozero.TheTnCCLRbitisnot usedinthePWMMode. |
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