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HT45R4U датащи(PDF) 65 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 65 Page - Holtek Semiconductor Inc |
65 / 105 page Rev. 1.10 64 �a��� 1�� �01� Rev. 1.10 6� �a��� 1�� �01� 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. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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