HT45F2020 datasheet(48/85 Pages) HOLTEK

48 / 85 page

Rev. 1.00

April 11, 2017

Rev. 1.00

April 11, 2017

HT45F2020/HT45F2022

Sound Effect Generator Flash MCU

HT45F2020/HT45F2022

Sound Effect Generator Flash MCU

IntheCompareMatchOutputMode,thePTIO1andPTIO0bitsdeterminehowthe

PTMoutputpinchangesstatewhenacomparematchoccursfromtheComparatorA.

ThePTMoutputpincanbesetuptoswitchhigh,switchlowortotoggleitspresent

statewhenacomparematchoccursfromtheComparatorA.Whenthebitsareboth

zero,thennochangewilltakeplaceontheoutput.TheinitialvalueofthePTMoutput

pinshouldbesetupusingthePTOCbitinthePTMC1register.Notethattheoutput

levelrequestedbythePTIO1andPTIO0bitsmustbedifferentfromtheinitialvalue

setupusingthePTOCbitotherwisenochangewilloccuronthePTMoutputpinwhen

acomparematchoccurs.AfterthePTMoutputpinchangesstate,itcanberesettoits

initiallevelbychangingthelevelofthePTONbitfromlowtohigh.

InthePWMMode,thePTIO1andPTIO0bitsdeterminehowtheTMoutputpin

changesstatewhenacertaincomparematchconditionoccurs.ThePTMoutputfunction

ismodifiedbychangingthesetwobits.Itisnecessarytoonlychangethevaluesofthe

PTIO1andPTIO0bitsonlyafterthePTMhasbeenswitchedoff.UnpredictablePWM

outputswilloccurifthePTIO1andPTIO0bitsarechangedwhenthePTMisrunning.

Bit3

PTOC:PTMPTPOutputcontrol

CompareMatchOutputMode

0:Initiallow

1:Initialhigh

PWMOutputMode/SinglePulseOutputMode

0:Activelow

1:Activehigh

ThisistheoutputcontrolbitforthePTMoutputpin.Itsoperationdependsupon

whetherPTMisbeingusedintheCompareMatchOutputModeorinthePWM

Mode/SinglePulseOutputMode.IthasnoeffectifthePTMisintheTimer/Counter

Mode.IntheCompareMatchOutputModeitdeterminesthelogiclevelofthePTM

outputpinbeforeacomparematchoccurs.InthePWMMode/SinglePulseOutput

ModeitdeterminesifthePWMsignalisactivehighoractivelow.

Bit2

PTPOL:PTMPTPOutputpolaritycontrol

0:Non-inverted

1:Inverted

ThisbitcontrolsthepolarityofthePTPoutputpin.WhenthebitissethighthePTM

outputpinwillbeinvertedandnotinvertedwhenthebitiszero.Ithasnoeffectifthe

PTMisintheTimer/CounterMode.

Bit1

PTCAPTS:PTMCaptureTriigerSourceselection

0:FromPTPIpin

1:FromPTCKpin

Bit0

PTCCLR:PTMCounterClearconditionselection

0:ComparatorPmatch

1:ComparatorAmatch

Thisbitisusedtoselectthemethodwhichclearsthecounter.Rememberthatthe

PeriodicTMcontainstwocomparators,ComparatorAandComparatorP,eitherof

whichcanbeselectedtocleartheinternalcounter.WiththePTCCLRbitsethigh,

thecounterwillbeclearedwhenacomparematchoccursfromtheComparatorA.

Whenthebitislow,thecounterwillbeclearedwhenacomparematchoccursfrom

theComparatorPorwithacounteroverflow.Acounteroverflowclearingmethodcan

onlybeimplementediftheCCRPbitsareallclearedtozero.ThePTCCLRbitisnot

usedinthePWMOutput,SinglePulseOutputorCaptureInputMode.

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