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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F2020 датащи(PDF) 63 Page - Holtek Semiconductor Inc |
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HT45F2020 датащи(HTML) 63 Page - Holtek Semiconductor Inc |
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63 / 85 page  Rev. 1.00 62 April 11, 2017 Rev. 1.00 63 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU Multi-function Interrupt WithinthedevicethereisaMulti-functioninterrupt.Unliketheotherindependentinterrupts,the interrupthasnoindependentsource,butratherareformedfromotherexistinginterruptsources, namelytheTMinterrupt. AMulti-functioninterruptrequestwilltakeplacewhenanyoftheMulti-functioninterruptrequest flagMFFisset.TheMulti-functioninterruptflagwillbesetwhenanyoftheirincludedfunctions generateaninterruptrequestflag.Toallowtheprogramtobranchtoitsrespectiveinterruptvector address,whentheMulti-functioninterruptisenabledandthestackisnotfull,andeitheroneofthe interruptscontainedwithineachofMulti-functioninterruptoccurs,asubroutinecalltooneofthe Multi-functioninterruptvectorswilltakeplace.Whentheinterruptisserviced,therelatedMulti- FunctionrequestflagwillbeautomaticallyresetandtheEMIbitwillbeautomaticallyclearedto disableotherinterrupts. However,itmustbenotedthat,althoughtheMulti-functionInterruptrequestflagswillbe automaticallyresetwhentheinterruptisserviced,therequestflagsfromtheoriginalsourceof theMulti-functioninterruptwillnotbeautomaticallyresetandmustbemanuallyresetbythe applicationprogram. Time Base Interrupt ThefunctionoftheTimeBaseInterruptistoprovideregulartimesignalintheformofaninternal interrupt.Itiscontrolledbytheoverflowsignalfromitsinternaltimer.Whenthishappensitsinterrupt requestflag,TBF,willbeset.Toallowtheprogramtobranchtoitsrespectiveinterruptvector addresses,theglobalinterruptenablebit,EMIandTimeBaseenablebit,TBE,mustfirstbeset. Whentheinterruptisenabled,thestackisnotfullandtheTimeBaseoverflows,asubroutinecallto itsrespectivevectorlocationwilltakeplace.Whentheinterruptisserviced,theinterruptrequestflag, TBF,willbeautomaticallyresetandtheEMIbitwillbeclearedtodisableotherinterrupts. ThepurposeoftheTimeBaseInterruptistoprovideaninterruptsignalatfixedtimeperiods.Its clocksource,fPSC,originatesfromtheinternalclocksourcefSYS,fSYS/4orfSUBandthenpasses throughadivider,thedivisionratioofwhichisselectedbyprogrammingtheappropriatebitsinthe TBCregistertoobtainlongerinterruptperiodswhosevalueranges.Theclocksourcewhichinturn controlstheTimeBaseinterruptperiodisselectedusingtheCLKSEL[1:0]inthePSCRregister respectively. fSYS/4 fSYS fSUB M U X Prescaler CLKSEL[1:0] fPSC fPSC/28 ~ fPSC/215 M U X TB[2:0] Time Base Interrupt TBON Time Base Interrupt PSCR Register Bit 7 6 5 4 3 2 1 0 Name — — — — — — CLKSEL1 CLKSEL0 R/W — — — — — — R/W R/W POR — — — — — — 0 0 Bit7~2 Unimplemented,readas“0” Bit1~0 CLKSEL1~CLKSEL0:Prescalerclocksourceselection 00:fSYS 01:fSYS/4 1x:fSUB |
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