HT83B60 datasheet(13/84 Pages) HOLTEK

13 / 84 page

Rev. 1.00

1�

De�e��e� 1�� 011

Rev. 1.00

De�e��e� 1�� 011

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 データシート(PDF) 13 Page - Holtek Semiconductor Inc

HT83B60 データシート(HTML) 13 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84

データシートダウンロード