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HT46R0042 Scheda tecnica(PDF) 21 Page - Holtek Semiconductor Inc

Il numero della parte HT46R0042
Spiegazioni elettronici  Cost-Effective A/D 8-Bit OTP MCU
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Produttore elettronici  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
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HT46R0042 Scheda tecnica(HTML) 21 Page - Holtek Semiconductor Inc

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HT46R0042
Cost-Effective A/D 8-Bit OTP MCU
HT46R0042
Cost-Effective A/D 8-Bit OTP MCU
Oscillator
Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious
applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest
optimizationcanbeachievedintermsofspeedandpowersaving.
System Oscillator Overview
Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources
fortheWatchdogTimerfunction,PWMfunction,Timer/EventcounterandTimeBase.
Type
Name
Freq.
Inte�nal High Speed RC
HIRC
8MHz
Inte�nal Low Speed RC
LIRC
1�kHz
Oscillator Types
System Clock Configurations
Thereisonesystemoscillatorimplementedinthedevice,internal8MHzRC,HIRC.Alsothereisan
internal12kHzRCoscillatorLIRCusedastheclocksourcefortheWDTfunction,PWMfunction,
Timer/EventcounterandTimeBase.Moredetailsaredescribedintheaccompanysections.
Internal RC Oscillator – HIRC
TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents.
TheinternalRCoscillatorhasthefrequencyof8MHz.Devicetrimmingduringthemanufacturing
processandtheinclusionofinternalfrequencycompensationcircuitisusedtoensurethatthe
influenceofthepowersupplyvoltage,temperatureandprocessvariationsontheoscillation
frequencyareminimized.Notethatthisinternalsystemclockoptionrequiresnoexternalpinsforits
operation.RefertotheA.C.Characteristicsformorefrequencyaccuracydetails.
Internal 12kHZ Oscillator – LIRC
TheLIRCisafullyself-containedfreerunningon-chipRCoscillatorwithatypicalfrequencyof
12kHzat5V,requiringnoexternalcomponentsforitsimplementation.Whenthedeviceentersthe
SleepMode,thesystemclockwillstoprunningbuttheLIRCoscillatorcontinuestofree-runand
tokeepthewatchdogactive.However,topreservepowerincertainapplicationstheLIRCcanbe
disabledbydisablingtheWDTfunction,PWMfunction,Timer/EventcounterandTimeBaseinthe
haltmode.


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