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HT66F4530 Datasheet(PDF) 51 Page - Holtek Semiconductor Inc |
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HT66F4530 Datasheet(HTML) 51 Page - Holtek Semiconductor Inc |
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51 / 224 page  Rev. 1.00 50 De�e��e� �1� �01� Rev. 1.00 51 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers Oscillators Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughtheapplicationprogramandrelevantcontrolregisters. Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Externaloscillatorsrequiringsomeexternal componentsaswellasfullyintegratedinternaloscillators,requiringnoexternalcomponents,are providedtoformawiderangeofbothfastandslowsystemoscillators.Alloscillatoroptionsare selectedthroughregisterprogramming.Thehigherfrequencyoscillatorsprovidehigherperformance butcarrywithitthedisadvantageofhigherpowerrequirements,whiletheoppositeisofcoursetrue forthelowerfrequencyoscillators.Withthecapabilityofdynamicallyswitchingbetweenfastand slowsystemclock,thesedeviceshavetheflexibilitytooptimizetheperformance/powerratio,a featureespeciallyimportantinpowersensitiveportableapplications. Type Name Frequency Pins Exte�nal High Speed C�ystal HXT 400kHz~1�MHz OSC1/OSC� Inte�nal High Speed RC HIRC �/4/8MHz — Exte�nal Low Speed C�ystal LXT 3�.7�8kHz XT1/XT� Inte�nal Low Speed RC LIRC 3�kHz — Oscillator Types System Clock Configurations Thereareseveraloscillatorsources,twohighspeedoscillatorsandtwolowspeedoscillators.The highspeedsystemclocksaresourcedfromtheexternalcrystal/ceramicoscillator,HXT,andthe internal2/4/8MHzRCoscillator,HIRC.Thelowspeedoscillatorsaretheexternal32.768kHz crystaloscillator,LXT,andtheinternal32kHzRCoscillator,LIRC.Selectingwhetherthelowor highspeedoscillatorisusedasthesystemoscillatorisimplementedusingtheCKS2~CKS0bitsin theSCCregisterandasthesystemclockcanbedynamicallyselected. TheactualsourceclockusedforthelowspeedoscillatorsischosenviatheFSSbitintheSCC registerwhileforthehighspeedoscillatorthesourceclockisselectedbytheFHSbitintheSCC register.Thefrequencyoftheslowspeedorhighspeedsystemclockisalsodeterminedusingthe CKS2~CKS0bitsintheSCCregister.Notethattwooscillatorselectionsmustbemadenamelyone highspeedandonelowspeedsystemoscillators.Itisnotpossibletochooseano-oscillatorselection foreitherthehighorlowspeedoscillator. |
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