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HT45R4U датащи(PDF) 65 Page - Holtek Semiconductor Inc

номер детали HT45R4U
подробное описание детали  TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R4U датащи(HTML) 65 Page - Holtek Semiconductor Inc

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HT45R4U
TinyPowerTM A/D Type
e-Banking ASSP OTP MCU with LCD
Multi-function Interrupt
AnadditionalinterruptknownastheMulti-functioninterruptisprovided.Unliketheother
interrupts,thisinterrupthasnoindependentsource,butratherisformedfromthreeotherexisting
interruptsources,namelytheA/DConverterinterruptandtwoTimeBaseinterrupts.
ForaMulti-functioninterrupttooccur,theglobalinterruptenablebit,EMI,andtheMulti-function
interruptenablebit,MFE,mustfirstbeset.AnactualMulti-functioninterruptwilltakeplacewhen
theMulti-functioninterruptrequestflag,MFF,isset.ThiswilloccurwheneitheraTimeBase
overfloworanA/Dconversioncompletioninterruptisgenerated.Whentheinterruptisenabledand
thestackisnotfull,andeitheroneoftheinterruptscontainedwithintheMulti-functioninterrupt
occurs,asubroutinecalltotheMulti-functioninterruptvectoratlocation018Hwilltakeplace.
Whentheinterruptisserviced,theMulti-Functionrequestflag,MFF,willbeautomaticallyreset
andtheEMIbitwillbeautomaticallyclearedtodisableotherinterrupts.However,itmustbenoted
thattherequestflagsfromtheoriginalsourceoftheMulti-functioninterrupt,namelytheTime-Base
interruptorA/DConverterinterruptwillnotbeautomaticallyresetandmustbemanuallyresetby
theapplicationprogram.
A/D Interrupt
TheA/DInterruptiscontainedwithintheMulti-functionInterrupt.
ForanA/DInterrupttobegenerated,theglobalinterruptenablebit,EMI,A/DInterruptenable
bit,ADE,andMulti-functioninterruptenablebit,MFE,mustfirstbeset.AnactualA/DInterrupt
willtakeplacewhentheA/DInterruptrequestflag,ADF,isset,asituationthatwilloccurwhen
theA/Dconversionprocesshasfinished.Whentheinterruptisenabled,thestackisnotfulland
theA/Dconversionprocesshasended,asubroutinecalltotheMulti-functioninterruptvectorat
location18H,willtakeplace.WhentheA/DInterruptisserviced,theEMIbitwillbeclearedto
disableotherinterrupts,howeveronlytheMFFinterruptrequestflagwillbereset.AstheADFflag
willnotbeautomaticallyreset,ithastobeclearedbytheapplicationprogram.
Time Base Interrupt
TwoTimeBaseInterruptsarecontainedwithintheMulti-functionInterrupt.
ForaTimeBaseInterrupttobegenerated,theglobalinterruptenablebit,EMI,thespecificTime
BaseInterruptenablebit,TBnE,andMulti-functioninterruptenablebit,MFE,mustfirstbeset.An
actualTimeBaseInterruptwilltakeplacewhentheTimeBaseInterruptrequestflag,TBnF,isset,
asituationthatwilloccurwhentheTimeBaseoverflows.Whentheinterruptisenabled,thestack
isnotfullandthespecificTimeBaseoverflows,asubroutinecalltotheMulti-functioninterrupt
vectoratlocation18H,willtakeplace.WhentheTimeBaseInterruptisserviced,theEMIbitwill
beclearedtodisableotherinterrupts,howeveronlytheMFFinterruptrequestflagwillbereset.As
theTBnFflagwillnotbeautomaticallyreset,ithastobeclearedbytheapplicationprogram.
ThepurposeoftheTimeBasefunctionistoprovideaninterruptsignalatfixedtimeperiods.The
TimeBaseinterruptclocksourceoriginatesfromtheinternalclocksourcefSUB.ThisfSinputclock
firstpassesthroughadivider,thedivisionratioofwhichisselectedbysoftwareselectionbitsto
providelongerTimeBaseinterruptperiods.TheTimeBase0interrupttime-outperiodrangesfrom
212/fSUB~215/fSUBwhiletheTimeBase1interrupttime-outperiodrangesfrom28/fSUB~215/fSUB.The
clocksource,fSUB,whichcontrolstheTimeBaseinterruptperiod,isderivedfromtheLXToscillator.
Essentiallyoperatingasaprogrammabletimer,whentheTimeBaseoverflowsitwillsetaTime
Baseinterruptflag,TBnF,whichwillinturngenerateanInterruptrequestviatheMulti-function
Interruptvector.


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