HT69F340 datasheet(32/235 Pages) HOLTEK

32 / 235 page

Rev. 1.30

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HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

Power on Reset Electrical Characteristics

Ta=�5°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VPOR

VDD Sta�t Voltage to Ensu�e Powe�-on Reset

—

100

�V

RRPOR

VDD Rising Rate to Ensu�e Powe�-on Reset

—

0.035

—

V/�s

tPOR

Mini�u� Ti�e fo� VDD Stays at VPOR to Ensu�e

Powe�-on Reset

—

�s

Ti me

V DD

V PO R

RR PO R

t PO R

System Architecture

Akeyfactorinthehigh-performancefeaturesoftheHoltekrangeofmicrocontrollersisattributed

totheirinternalsystemarchitecture.Theseriesofdevicestakeadvantageoftheusualfeaturesfound

withinRISCmicrocontrollersprovidingincreasedspeedofoperationandPeriodicperformance.The

pipeliningschemeisimplementedinsuchawaythatinstructionfetchingandinstructionexecution

areoverlapped,henceinstructionsareeffectivelyexecutedinonecycle,withtheexceptionofbranch

orcallinstructions.An8-bitwideALUisusedinpracticallyallinstructionsetoperations,which

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

etc.TheinternaldatapathissimplifiedbymovingdatathroughtheAccumulatorandtheALU.

CertaininternalregistersareimplementedintheDataMemoryandcanbedirectlyorindirectly

addressed.Thesimpleaddressingmethodsoftheseregistersalongwithadditionalarchitectural

featuresensurethataminimumofexternalcomponentsisrequiredtoprovideafunctionalI/O

controlsystemwithmaximumreliabilityandflexibility.Thismakesthedevicessuitableforlow-

cost,high-volumeproductionforcontrollerapplications.

Clocking and Pipelining

Themainsystemclock,derivedfromeitheraHXT,LXT,HIRCorLIRCoscillatorissubdivided

intofourinternallygeneratednon-overlappingclocks,T1~T4.TheProgramCounterisincremented

atthebeginningoftheT1clockduringwhichtimeanewinstructionisfetched.Theremaining

T2~T4clockscarryoutthedecodingandexecutionfunctions.Inthisway,oneT1~T4clock

cycleformsoneinstructioncycle.Althoughthefetchingandexecutionofinstructionstakesplace

inconsecutiveinstructioncycles,thepipeliningstructureofthemicrocontrollerensuresthat

instructionsareeffectivelyexecutedinoneinstructioncycle.Theexceptiontothisareinstructions

wherethecontentsoftheProgramCounterarechanged,suchassubroutinecallsorjumps,inwhich

casetheinstructionwilltakeonemoreinstructioncycletoexecute.

HT69F340 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc

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