 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
HT66F019 Datasheet(PDF) 36 Page - Holtek Semiconductor Inc |
|
|
|||||||||||||||||||||||||||||
HT66F019 Datasheet(HTML) 36 Page - Holtek Semiconductor Inc |
|
|
36 / 175 page  Rev. 1.00 36 De�e��e� 01� �01� Rev. 1.00 3� De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM Oscillators Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughacombinationofconfigurationoptionsandregisters. Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources fortheWatchdogTimerandTimeBaseInterrupts.Externaloscillatorsrequiringsomeexternal componentsaswellasfullyintegratedinternaloscillators,requiringnoexternalcomponents, areprovidedtoformawiderangeofbothfastandslowsystemoscillators.Alloscillatoroptions areselectedthroughtheconfigurationoptions.Thehigherfrequencyoscillatorsprovidehigher performancebutcarrywithitthedisadvantageofhigherpowerrequirements,whiletheopposite isofcoursetrueforthelowerfrequencyoscillators.Withthecapabilityofdynamicallyswitching betweenfastandslowsystemclock,thedevicehastheflexibilitytooptimizetheperformance/ powerratio,afeatureespeciallyimportantinpowersensitiveportableapplications. Type Name Frequency Pins High Speed Exte�nal C�ystal HXT 400kHz~16MHz OSC1/OSC� High Speed Inte�nal RC HIRC 8/1�/16MHz — Low Speed Exte�nal C�ystal LXT 3�.�68kHz XT1/XT� Low Speed Inte�nal RC LIRC 3�kHz — Oscillator Types System Clock Configurations Therearefourmethodsofgeneratingthesystemclock,twohighspeedoscillatorandtwolow speedoscillator.Thehighspeedoscillatorsaretheexternalcrystal/ceramicoscillator,HXT,andthe internal8/12/16MHzRCoscillator,HIRC.Thetwolowspeedoscillatorsaretheinternal32kHz RCoscillator,LIRC,andtheexternal32.768kHzcrystaloscillator,LXT.Selectingwhetherthelow orhighspeedoscillatorisusedasthesystemoscillatorisimplementedusingtheHLCLKbitand CKS2~CKS0bitsintheSMODregisterandasthesystemclockcanbedynamicallyselected. Theactualsourceclockusedforthehighspeedandlowspeedoscillatorsischosenviaconfiguration options.Thefrequencyoftheslowspeedorhighspeedsystemclockisalsodeterminedusingthe HLCLKbitandCKS2~CKS0bitsintheSMODregister.Notethattwooscillatorselectionsmustbe madenamelyonehighspeedandonelowspeedsystemoscillators.Itisnotpossibletochooseano- oscillatorselectionforeitherthehighorlowspeedoscillator.TheOSC1/OSC2andXT1/XT2pins areusedtoconnecttheexternalcomponentsfortheexternalcrystal. |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
