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HT46R002 датащи(PDF) 59 Page - Holtek Semiconductor Inc

номер детали HT46R002
подробное описание детали  Cost-Effective A/D 8-Bit OTP MCU
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
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HT46R002 датащи(HTML) 59 Page - Holtek Semiconductor Inc

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Rev. 1.21
58
April 11, 2017
Rev. 1.21
59
April 11, 2017
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
Interrupt Operation
ATimer/EventCounteroverflow,acompletionofA/Dconversionoranactiveedgeontheexternal
interruptpinwillallgenerateaninterruptrequestbysettingtheircorrespondingrequestflag,if
theirappropriateinterruptenablebitisset.Whenthishappens,theProgramCounter,whichstores
theaddressofthenextinstructiontobeexecuted,willbetransferredontothestack.TheProgram
Counterwillthenbeloadedwithanewaddresswhichwillbethevalueofthecorresponding
interruptvector.Themicrocontrollerwillthenfetchitsnextinstructionfromthisinterruptvector.
TheinstructionatthisvectorwillusuallybeaJMPstatementwhichwilljumptoanothersection
ofprogramwhichisknownastheinterruptserviceroutine.Hereislocatedthecodetocontrolthe
appropriateinterrupt.TheinterruptserviceroutinemustbeterminatedwithaRETIinstruction,
whichretrievestheoriginalProgramCounteraddressfromthestackandallowsthemicrocontroller
tocontinuewithnormalexecutionatthepointwheretheinterruptoccurred.
Thevariousinterruptenablebits,togetherwiththeirassociatedrequestflags,areshowninthe
followingdiagramwiththeirorderofpriority.
Au to ma ti ca lly c l ear ed b y IS R
m anual ly s et o r cl ear ed by s o ftw ar e
Ex te rn al I nt er ru pt
R eques t Fl ag IN TF
Ti me r/ Ev ent C ount er 0
In te rr up t R eques t Fl ag T 0F
IN TE
T0 E
EM I
Pr io ri ty
Hi gh
Low
In te rr upt
Po llin g
AD E
A/ D C onv er si on
In te rr upt R eques t Fl ag A DF
Au to ma ti ca ll y di s abl ed by I SR
c an be enabl ed m anua lly
EM I
EM I
Interrupt Scheme
Onceaninterruptsubroutineisserviced,alltheotherinterruptswillbeblocked,astheEMIbitwill
beclearedautomatically.Thiswillpreventanyfurtherinterruptnestingfromoccurring.However,
ifotherinterruptrequestsoccurduringthisinterval,althoughtheinterruptwillnotbeimmediately
serviced,therequestflagwillstillberecorded.Ifaninterruptrequiresimmediateservicingwhilethe
programisalreadyinanotherinterruptserviceroutine,theEMIbitshouldbesetafterenteringthe
routine,toallowinterruptnesting.Ifthestackisfull,theinterruptrequestwillnotbeacknowledged,
eveniftherelatedinterruptisenabled,untiltheStackPointerisdecremented.Ifimmediateservice
isdesired,thestackmustbepreventedfrombecomingfull.
Whenaninterruptrequestisgeneratedittakes2or3instructioncyclesbeforetheprogramjumpsto
theinterruptvector.IfthedeviceisintheSleepModeandiswokenupbyaninterruptrequestthen
itwilltake3cyclesbeforetheprogramjumpstotheinterruptvector.


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