Masterclock TCR1000 Manual do Utilizador descarregar pdf (Página 22)

TCR1000SDK–Rev.3.0.0   Page22

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TheTimeSetInterrupt,TimeLossInterrupt,andTimeGainInterruptarealwaysthrownbytheTCR

whensaideventoccursandcannotbedisabled.TheseinterruptsaresupportedbytheTCRinall

modesoftimecodedecodingoperation.

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WhentheOnce/SecondInterruptisenabledtheTimeSet

Interruptispreemptedandwillnotbe

passedbytheTCRdrivertotheAPI.WhentheStartTimeCodeInterruptisenabledboththeTimeSet

InterruptandOnce/SecondInterruptarepreempted.Thereasonforthepreemptionisthatallthree

interrupts,regardlessoffrequency,willfallatthesame

timecodetransitionpointinreal‐time.The

preemptionisinternaltotheTCR.Whenathreadenablesanasynchronousnotificationcallbackhook

thatmapstoaTCR“enhancedinterrupt”thatinterruptwillbeenabledontimecodereadercard.It

followsthatonecanbreaktheoperationofanotherthread/process’scallbackfunctionsbyenabling

an“enhancedinterrupt”ontheTCRthatpreemptsanotherinterrupt(aspreviouslydiscussed).

Cautionshouldbeexercisedinplanningwhatcallbackhookswillbeusedbyanapplicationcallingthe

API’s.Inenvironmentswheremultithreaded/multiprocessuseoftheAPIisplanneditisstrongly

recommendedthatallapplicationsutilizeonlytheASYNC_TIMESETcallbackhook(TCRTimeSet

Interrupt).

LegalInformation

Theinformationcontainedinthisdocumentissubjecttochangewithoutnotice.Masterclock,Inc.

(hereinafterMasterclock)providestheAPIdevelopmentsoftwarepackageonanas‐isbasis.

Masterclockmakesnowarrantyofanykindwithregardtothismaterial,including,butnotlimitedto,

theimpliedwarrantiesofmerchantabilityandfitnessforaparticularpurpose.Masterclockshallnot

beliableforerrorscontainedhereinorforincidentalorconsequentialdamagesinconnectionwith

thefurnishing,performance,oruseofthismaterial.

API/DocumentRevisionHistory

‐ NewreleaseSeptember1,2011

ContactingUs

Masterclock,Inc.

2484WestClayStreet

St.Charles,MO63301USA

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website

www.masterclock.com

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1‐636‐724‐3776(fax)

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International

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Sales

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TechnicalSupport

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