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HT46R003B Datenblatt(PDF) 23 Page - Holtek Semiconductor Inc

Teilenummer HT46R003B
Bauteilbeschribung  Cost-Effective A/D 8-bit OTP MCU
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Hersteller  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT46R003B Datenblatt(HTML) 23 Page - Holtek Semiconductor Inc

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HT46R003B
Cost-Effective A/D 8-bit OTP MCU
HT46R003B
Cost-Effective A/D 8-bit OTP MCU
Ifthesystemiswokenupbyanexternalreset,thedevicewillexperienceafullsystemreset,
however,ifthedeviceiswokenupbyaWDToverflow,aWatchdogTimerresetwillbeinitiated.
Althoughbothofthesewake-upmethodswillinitiatearesetoperation,theactualsourceofthe
wake-upcanbedeterminedbyexaminingtheTOandPDFflags.ThePDFflagisclearedbya
systempower-uporexecutingtheclearWatchdogTimerinstructionsandissetwhenexecutingthe
“HALT”instruction.TheTOflagissetifaWDTtime-outoccurs,andcausesawake-upthatonly
resetstheProgramCounterandStackPointer,theotherflagsremainintheiroriginalstatus.
PinsPA0~PA7canbesetviathePAWUregistertopermitanegativetransitiononthepintowake-up
thesystem.WhenaPA0~PA7pinwake-upoccurs,theprogramwillresumeexecutionatthe
instructionfollowingthe“HALT”instruction.
Ifthesystemiswokenupbyaninterrupt,thentwopossiblesituationsmayoccur.Thefirstiswhere
therelatedinterruptisdisabledortheinterruptisenabledbutthestackisfull,inwhichcasethe
programwillresumeexecutionattheinstructionfollowingthe“HALT”instruction.Inthissituation,
theinterruptwhichwoke-upthedevicewillnotbeimmediatelyserviced,butwillratherbeserviced
laterwhentherelatedinterruptisfinallyenabledorwhenastacklevelbecomesfree.Theother
situationiswheretherelatedinterruptisenabledandthestackisnotfull,inwhichcasetheregular
interruptresponsetakesplace.IfaninterruptrequestflagissethighbeforeenteringtheSLEEP
Mode,thewake-upfunctionoftherelatedinterruptwillbeignored.
Nomatterwhatthesourceofthewake-upeventis,onceawake-upeventoccurs,therewillbea
timedelaybeforenormalprogramexecutionresumes.Consultthetablefortherelatedtime
Wake-up Source
Oscillator Type
HIRC, LIRC
External RES
tRSTD + tSST
PA Port
tSST
Interr�pt
WDT Overflow
Note:1.tRSTD(resetdelaytime),tSYS(systemclock)
2.tRSTDispower-ondelay,typicaltime=50ms
3.tSST=16tSYS
Wake-up Delay Time


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