HT66F60 datasheet(28/298 Pages) HOLTEK

28 / 298 page

Rev. 1.90

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Rev. 1.90

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

System Architecture

Akeyfactorinthehigh-performancefeaturesoftheHoltekrangeofmicrocontrollersisattributed

totheirinternalsystemarchitecture.Therangeofdevicestakeadvantageoftheusualfeaturesfound

withinRISCmicrocontrollersprovidingincreasedspeedofoperationandenhancedperformance.

Thepipeliningschemeisimplementedinsuchawaythatinstructionfetchingandinstruction

executionareoverlapped,henceinstructionsareeffectivelyexecutedinonecycle,withthe

exceptionofbranchorcallinstructions.An8-bitwideALUisusedinpracticallyallinstructionset

operations,whichcarriesoutarithmeticoperations,logicoperations,rotation,increment,decrement,

branchdecisions,etc.TheinternaldatapathissimplifiedbymovingdatathroughtheAccumulator

andtheALU.CertaininternalregistersareimplementedintheDataMemoryandcanbedirectly

orindirectlyaddressed.Thesimpleaddressingmethodsoftheseregistersalongwithadditional

architecturalfeaturesensurethataminimumofexternalcomponentsisrequiredtoprovidea

functionalI/OandA/Dcontrolsystemwithmaximumreliabilityandflexibility.Thismakesthe

devicesuitableforlow-cost,high-volumeproductionforcontrollerapplications.

Clocking and Pipelining

Themainsystemclock,derivedfromeitheraHXT,LXT,HIRC,LIRCorERCoscillatoris

subdividedintofourinternallygeneratednon-overlappingclocks,T1~T4.TheProgramCounteris

incrementedatthebeginningoftheT1clockduringwhichtimeanewinstructionisfetched.The

remainingT2~T4clockscarryoutthedecodingandexecutionfunctions.Inthisway,oneT1~T4

clockcycleformsoneinstructioncycle.Althoughthefetchingandexecutionofinstructionstakes

placeinconsecutiveinstructioncycles,thepipeliningstructureofthemicrocontrollerensuresthat

instructionsareeffectivelyexecutedinoneinstructioncycle.Theexceptiontothisareinstructions

wherethecontentsoftheProgramCounterarechanged,suchassubroutinecallsorjumps,inwhich

casetheinstructionwilltakeonemoreinstructioncycletoexecute.

Fe tc h In st . ( PC )

Ex ec ut e In st . (P C- 1)

Fe tc h In st . (P C+ 1)

Ex ec ut e In st . (P C)

Fe tc h In st . (P C+ 2)

Ex ec ut e In st . (P C+ 1)

PC +1

PC +2

f SY S

(S yst em C lo ck)

P has e Cl o ck T1

Pr ogr am C oun te r

P has e Cl o ck T2

P has e Cl o ck T3

P has e Cl o ck T4

Pi pe lin in g

System Clocking and Pipelining

HT66F60 Datasheet(PDF) 28 Page - Holtek Semiconductor Inc

HT66F60 Datasheet(HTML) 28 Page - Holtek Semiconductor Inc

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