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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT67F4892 데이터시트(PDF) 41 Page - Holtek Semiconductor Inc |
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HT67F4892 데이터시트(HTML) 41 Page - Holtek Semiconductor Inc |
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41 / 188 page  Rev. 1.00 �0 �ove��e� ��� �01� Rev. 1.00 �1 �ove��e� ��� �01� HT67F4892 Enhanced A/D Flash MCU with LCD & EEPROM HT67F4892 Enhanced A/D Flash MCU with LCD & EEPROM LXT Oscillator Low Power Function TheLXToscillatorcanfunctioninoneoftwomodes,theQuickStartModeandtheLowPower Mode.ThemodeselectionisexecutedusingtheLXTLPbitintheFSUBCregister. • FSUBC Register Bit 7 6 5 4 3 2 1 0 �a�e LXTLP FSUB� FSUB5 FSUB� FSUB3 FSUB� FSUB1 FSUB0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 0 1 0 1 0 1 0 Bit7 LXTLP:LXTLowPowerControl 0:QuickStartMode 1:LowPowerMode Bit6~0 FSUB6~FSUB0:fSUBclocksourceselection 0101010:LIRC 1010101:LXT Other:MCUreset Afterpoweron,theLXTLPbitwillbeautomaticallyclearedtozeroensuringthatthe LXToscillatorisintheQuickStartoperatingmode.IntheQuickStartModetheLXT oscillatorwillpowerupandstabilisequickly.However,aftertheLXToscillatorhas fullypoweredupitcanbeplacedintotheLow-powermodebysettingtheLXTLP bithigh.Theoscillatorwillcontinuetorunbutwithreducedcurrentconsumption,as thehighercurrentconsumptionisonlyrequiredduringtheLXToscillatorstart-up.In powersensitiveapplications,suchasbatteryapplications,wherepowerconsumption mustbekepttoaminimum,itisthereforerecommendedthattheapplicationprogram setstheLXTLPbithighabout2secondsafterpower-on. Itshouldbenotedthat,nomatterwhatconditiontheLXTLPbitissetto,theLXT oscillatorwillalwaysfunctionnormally,theonlydifferenceisthatitwilltakemore timetostartupifintheLow-powermode. Internal 32kHz Oscillator – LIRC Theinternal32kHzsystemoscillatorisoneofthelowfrequencyoscillatorchoices,whichis selectedviatheFSUBCregister.ItisafullyintegratedRCoscillatorwithatypicalfrequencyof 32kHzat5V,requiringnoexternalcomponentsforitsimplementation.Devicetrimmingduring themanufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareused toensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe oscillationfrequencyareminimised.Asaresult,atapowersupplyof5Vandatatemperatureof 25°Cdegrees,thefixedoscillationfrequencyof32kHzwillhaveatolerancewithin10%. |
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