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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) 23 Page - Holtek Semiconductor Inc |
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HT45F2020 датащи(HTML) 23 Page - Holtek Semiconductor Inc |
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23 / 85 page  Rev. 1.00 22 April 11, 2017 Rev. 1.00 23 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU Oscillators Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughtherelevantcontrolregister. Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Twofullyintegratedinternaloscillators,requiring noexternalcomponents,areprovidedtoformarangeofbothfastandslowsystemoscillators.The higherfrequencyoscillatorprovideshigherperformancebutcarrywithitthedisadvantageofhigher powerrequirements,whiletheoppositeisofcoursetrueforthelowerfrequencyoscillator.With thecapabilityofdynamicallyswitchingbetweenfastandslowsystemclock,thedevicehasthe flexibilitytooptimizetheperformance/powerratio,afeatureespeciallyimportantinpowersensitive portableapplications. Type Name Frequency Internal High Speed RC HIRC 8MHz Internal Low Speed RC LIRC 32kHz Oscillator Types System Clock Configurations Therearetwomethodsofgeneratingthesystemclock,ahighspeedoscillatorandalowspeed oscillator.Thehighspeedoscillatoristheinternal8MHzRCoscillator.Thelowspeedoscillatoris theinternal32kHzRCoscillator.Selectingwhethertheloworhighspeedoscillatorisusedasthe systemoscillatorisimplementedusingtheCKS2~CKS0bitsintheSCCregisterandasthesystem clockcanbedynamicallyselected. HIRCEN Prescaler High Speed Oscillator Low Speed Oscillator fH/2 fH/16 fH/64 fH/8 fH/4 fH/32 CKS2~CKS0 fSYS fSUB fSUB LIRC fLIRC fLIRC HIRC fH IDLE0 SLEEP IDLE2 SLEEP System Clock Configurations |
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