HT66F0182 datasheet(13/116 Pages) HOLTEK

13 / 116 page

Rev. 1.00

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Rev. 1.00

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HT66F0182

A/D 8-Bit Flash MCU

HT66F0182

A/D 8-Bit Flash MCU

Power-on Reset Electrical Characteristics

Ta=��°C

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

VDD

Conditions

VPOR

VDD sta�t voltage to ensu�e powe�-on �eset

—

100

�V

RRPOR

VDD �ising �ate to ensu�e powe�-on �eset

—

0.03�

—

V/�s

tPOR

Mini�u� ti�e fo� VDD stays at VPOR to

ensu�e powe�-on �eset

—

�s

VDD

tPOR

RRPOR

VPOR

Ti�e

System Architecture

Akeyfactorinthehigh-performancefeaturesoftheHoltekrangeofmicrocontrollersisattributed

totheirinternalsystemarchitecture.Thedevicetakesadvantageoftheusualfeaturesfoundwithin

RISCmicrocontrollersprovidingincreasedspeedofoperationandenhancedperformance.The

pipeliningschemeisimplementedinsuchawaythatinstructionfetchingandinstructionexecution

areoverlapped,henceinstructionsareeffectivelyexecutedinonecycle,withtheexceptionofbranch

orcallinstructions.An8-bitwideALUisusedinpracticallyallinstructionsetoperations,which

carriesoutarithmeticoperations,logicoperations,rotation,increment,decrement,branchdecisions,

etc.TheinternaldatapathissimplifiedbymovingdatathroughtheAccumulatorandtheALU.

CertaininternalregistersareimplementedintheDataMemoryandcanbedirectlyorindirectly

addressed.Thesimpleaddressingmethodsoftheseregistersalongwithadditionalarchitectural

featuresensurethataminimumofexternalcomponentsisrequiredtoprovideafunctionalI/Oand

A/Dcontrolsystemwithmaximumreliabilityandflexibility.Thismakesthedevicesuitableforlow-

cost,high-volumeproductionforcontrollerapplications.

Clocking and Pipelining

Themainsystemclock,derivedfromeitheraHIRCorLIRCoscillatorissubdividedintofour

internallygeneratednon-overlappingclocks,T1~T4.TheProgramCounterisincrementedatthe

beginningoftheT1clockduringwhichtimeanewinstructionisfetched.TheremainingT2~T4

clockscarryoutthedecodingandexecutionfunctions.Inthisway,oneT1~T4clockcycleforms

oneinstructioncycle.Althoughthefetchingandexecutionofinstructionstakesplaceinconsecutive

instructioncycles,thepipeliningstructureofthemicrocontrollerensuresthatinstructionsare

effectivelyexecutedinoneinstructioncycle.Theexceptiontothisareinstructionswherethe

contentsoftheProgramCounterarechanged,suchassubroutinecallsorjumps,inwhichcasethe

instructionwilltakeonemoreinstructioncycletoexecute.

HT66F0182 Datasheet(PDF) 13 Page - Holtek Semiconductor Inc

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