HT83B60 datasheet(13/84 Pages) HOLTEK

13 / 84 page

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HT83B60

Voice Mask MCU

HT83B60

Voice Mask MCU

System Architecture

Akeyfactorinthehigh-performancefeaturesoftheHoltekrangeofmicrocontrollersisattributed

totheinternalsystemarchitecture.Therangeofdevicestakeadvantageoftheusualfeaturesfound

withinRISCmicrocontrollersprovidingincreasedspeedofoperationandenhancedperformance.

Thepipeliningschemeisimplementedinsuchawaythatinstructionfetchingandinstruction

executionareoverlapped,henceinstructionsareeffectivelyexecutedinonecycle,withthe

exceptionofbranchorcallinstructions.An8-bitwideALUisusedinpracticallyalloperations

oftheinstructionset.Itcarriesoutarithmeticoperations,logicoperations,rotation,increment,

decrement,branchdecisions,etc.Theinternaldatapathissimplifiedbymovingdatathroughthe

AccumulatorandtheALU.CertaininternalregistersareimplementedintheDataMemoryand

canbedirectlyorindirectlyaddressed.Thesimpleaddressingmethodsoftheseregistersalong

withadditionalarchitecturalfeaturesensurethataminimumofexternalcomponentsisrequiredto

provideafunctionalI/Ocontrolsystemwithmaximumreliabilityandflexibility.

Clocking and Pipelining

Themainsystemclock,derivedfromeitheraCrystal,ERCorIRCoscillator,issubdividedinto

fourinternallygeneratednon-overlappingclocks,T1~T4.TheProgramCounterisincrementedat

thebeginningoftheT1clockduringwhichtimeanewinstructionisfetched.TheremainingT2~T4

clockscarryoutthedecodingandexecutionfunctions.Inthisway,oneT1~T4clockcycleforms

oneinstructioncycle.Althoughthefetchingandexecutionofinstructionstakesplaceinconsecutive

instructioncycles,thepipeliningstructureofthemicrocontrollerensuresthatinstructionsare

effectivelyexecutedinoneinstructioncycle.Theexceptiontothisareinstructionswherethe

contentsoftheProgramCounterarechanged,suchassubroutinecallsorjumps,inwhichcasethe

instructionwilltakeonemoreinstructioncycletoexecute.

Forinstructionsinvolvingbranches,suchasjumporcallinstructions,twomachinecyclesare

requiredtocompleteinstructionexecution.Anextracycleisrequiredastheprogramtakesone

cycletofirstobtaintheactualjumporcalladdressandthenanothercycletoactuallyexecutethe

branch.Therequirementforthisextracycleshouldbetakenintoaccountbyprogrammersintiming

sensitiveapplications.

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

O sci ll at or C lo ck

(S yst em C lo ck)

P has e Cl o ck T 1

Pr og ra m C oun te r

P has e Cl o ck T 2

P has e Cl o ck T 3

P has e Cl o ck T 4

Pi pe lin in g

System Clocking and Pipelining

HT83B60 데이터시트(PDF) 13 Page - Holtek Semiconductor Inc

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