HT66F005 datasheet(55/109 Pages) HOLTEK

55 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

Programming Considerations

Withintheuserprogram,oneofthefirstthingstoconsiderisportinitialisation.Afterareset,allof

theI/Odataandportcontrolregisterwillbesethigh.ThismeansthatallI/Opinswilldefaultto

aninputstate,thelevelofwhichdependsontheotherconnectedcircuitryandwhetherpull-high

selectionshavebeenchosen.Iftheportcontrolregister,PAC,isthenprogrammedtosetupsome

pinsasoutputs,theseoutputpinswillhaveaninitialhighoutputvalueunlesstheassociatedport

dataregister,PA,isfirstprogrammed.Selectingwhichpinsareinputsandwhichareoutputscan

beachievedbyte-widebyloadingthecorrectvaluesintotheappropriateportcontrolregisteror

byprogrammingindividualbitsintheportcontrolregisterusingthe"SET[m].i"and"CLR[m].i"

instructions.Notethatwhenusingthesebitcontrolinstructions,aread-modify-writeoperationtakes

place.Themicrocontrollermustfirstreadinthedataontheentireport,modifyittotherequirednew

bitvaluesandthenrewritethisdatabacktotheoutputports.

Thepower-onresetconditionoftheA/DconvertercontrolregistersensuresthatanyA/Dinput

pinswhicharealwayssharedwithotherI/Ofunctionswillbesetupasanaloginputsafterareset.

AlthoughthesepinswillbeconfiguredasA/Dinputsafterareset,theA/Dconverterwillnotbe

switchedon.ItisthereforeimportanttonotethatifitisrequiredtousethesepinsasI/Odigital

inputpinsorasotherfunctions,theA/Dconvertercontrolregistersmustbecorrectlyprogrammed

toremovetheA/Dfunction.NotealsothatastheA/Dchannelisenabled,anyinternalpull-high

resistorconnectionswillberemoved.

PortAhastheadditionalcapabilityofprovidingwake-upfunctions.Whenthedeviceisinthe

SLEEPorIDLEMode,variousmethodsareavailabletowakethedeviceup.Oneoftheseisahigh

tolowtransitionofanyofthePortApins.SingleormultiplepinsonPortAcanbesetuptohavethis

function.

Timer Modules – TM

Oneofthemostfundamentalfunctionsinanymicrocontrollerdeviceistheabilitytocontroland

measuretime.ToimplementtimerelatedfunctionseachdeviceincludesseveralTimerModules,

abbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide

operationssuchasTimer/Counter,CompareMatchOutputaswellasbeingthefunctionalunitfor

thegenerationofPWMsignals.EachoftheTMshastwoindividualinterrupts.Theadditionof

inputandoutputpinsforeachTMensuresthatusersareprovidedwithtimingunitswithawideand

flexiblerangeoffeatures.

Introduction

ThedevicescontaintwoTMswitheachTMhavingareferencenameofTM0andTM1.Each

individualTMcanbecategorisedasacertaintype,namelyCompactTypeTM,socalledCTM.The

mainfeaturesoftheTMsaresummarisedintheaccompanyingtable.

Function

CTM

Time�/Counte�

√

Com�a�e Match Out�ut

√

PWM Channe�s

PWM ��ignment

Edge

PWM �djustment Pe�iod & Duty

Duty o� Pe�iod

TM Function Summary

HT66F005 Datasheet(PDF) 55 Page - Holtek Semiconductor Inc

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