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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT69F240 датащи(PDF) 32 Page - Holtek Semiconductor Inc |
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HT69F240 датащи(HTML) 32 Page - Holtek Semiconductor Inc |
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32 / 172 page  Rev. 1.20 32 �a��� 2�� 201� Rev. 1.20 33 �a��� 2�� 201� HT69F240 I/O 8-Bit Flash MCU with LED/LCD Driver HT69F240 I/O 8-Bit Flash MCU with LED/LCD Driver Oscillator Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughacombinationofconfigurationoptionsandregisters. Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Externaloscillatorsrequiringsomeexternal componentsaswellasfullyintegratedinternaloscillators,requiringnoexternalcomponents, areprovidedtoformawiderangeofbothfastandslowsystemoscillators.Alloscillatoroptions areselectedthroughtheconfigurationoptions.Thehigherfrequencyoscillatorsprovidehigher performancebutcarrywithitthedisadvantageofhigherpowerrequirements,whiletheopposite isofcoursetrueforthelowerfrequencyoscillators.Withthecapabilityofdynamicallyswitching betweenfastandslowsystemclock,thedevicehastheflexibilitytooptimizetheperformance/power ratio,afeatureespeciallyimportantinpowersensitiveportableapplications. Type Name Freq. Pins Exte�nal C�ystal HXT 400kHz~16�Hz OSC1/OSC2 Inte�nal Hig� Speed RC HIRC 4� 8 o� 12�Hz — Exte�nal Low Speed C�ystal LXT 32.768kHz XT1/XT2 Inte�nal Low Speed RC LIRC 32kHz — Oscillator Types System Clock Configurations Therearefourmethodsofgeneratingthesystemclock,twohighspeedoscillatorsandtwolow speedoscillators.Thehighspeedoscillatorsareistheexternalcrystal/ceramicoscillatorandthe internal4MHz,8MHzor12MHzRCoscillator.Thetwolowspeedoscillatorsaretheinternal32kHz RCoscillatorandtheexternal32.768kHzcrystaloscillator.Selectingwhethertheloworhighspeed oscillatorisusedasthesystemoscillatorisimplementedusingtheHLCLKbitandCKS2~CKS0 bitsintheSMODregisterandasthesystemclockcanbedynamicallyselected. HXT HIRC Prescaler fH LIRC LXT HighSpeedOscillation (HOSC) LowSpeedOscillation (LOSC) fH/2 fH/16 fH/64 fH/8 fH/4 fH/32 HighSpeedOscillation ConfigurationOption LowSpeedOscillation ConfigurationOption CKS[2:0], HLCLK fSYS FastWake-upfromSLEEPModeor IDLEModeControl(forHXTonly) fSYS/4 fSUB fTB WDT TimeBase TBCK fSUB |
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