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HT48R068B Datenblatt(PDF) 70 Page - Holtek Semiconductor Inc

Teilenummer HT48R068B
Bauteilbeschribung  Enhanced I/O 8-Bit OTP MCU
Download  118 Pages
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Hersteller  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48R068B Datenblatt(HTML) 70 Page - Holtek Semiconductor Inc

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HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
HT48R068B/HT48R069B
Enhanced I/O 8-Bit OTP MCU
Programming Considerations
Bydisablingtherelevantinterruptenablebits,arequestedinterruptcanbepreventedfrombeing
serviced,however,onceaninterruptrequestflagisset,itwillre-maininthisconditioninthe
interruptregisteruntilthecorrespondinginterruptisservicedoruntiltherequestflagisclearedby
theapplicationprogram.
WhereacertaininterruptiscontainedwithintheMulti-function interrupt, thenwhenthe
interruptserviceroutineisexecuted,asonlytheMulti-functioninterruptrequestflag,MFF,will
beautomaticallycleared,theindividualrequestflagforthefunctionneedstobeclearedbythe
applicationprogram.
ItisrecommendedthatprogramsdonotusetheCALLinstructionwithintheinterruptservice
subroutine.Interruptsoftenoccurinanunpredictablemannerorneedtobeservicedimmediately.
Ifonlyonestackisleftandtheinterruptisnotwellcontrolled,theoriginalcontrolsequencewillbe
damagedonceaCALLsubroutineisexecutedintheinterruptsubroutine.
EveryinterrupthasthecapabilityofwakingupthemicrocontrollerwhenitisinSLEEPorIDLE
Mode,thewakeupbeinggeneratedwhentheinterruptrequestflagchangesfromlowtohigh.Ifitis
requiredtopreventacertaininterruptfromwakingupthemicrocontrollerthenitsrespectiverequest
flagshouldbefirstsethighbeforeenteringtheSLEEPorIDLEMode.
AsonlytheProgramCounterispushedontothestack,thenwhentheinterruptisserviced,ifthe
contentsoftheaccumulator,statusregisterorotherregistersarealteredbytheinterruptservice
program,theircontentsshouldbesavedtothememoryatthebeginningoftheinterruptservice
routine.
Toreturnfromaninterruptsubroutine,eitheraRETorRETIinstructionmaybeexecuted.TheRETI
instructioninadditiontoexecutingareturntothemainprogramalsoautomaticallysetstheEMI
bithightoallowfurtherinterrupts.TheRETinstructionhoweveronlyexecutesareturntothemain
programleavingtheEMIbitinitspresentzerostateandthereforedisablingtheexecutionoffurther
interrupts.


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