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HT45R4U датащи(PDF) 74 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 74 Page - Holtek Semiconductor Inc |
74 / 105 page Rev. 1.10 74 �a��� 1�� �01� Rev. 1.10 7� �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD LXT Oscillator Low Power Function TheLXToscillatorcanfunctioninoneoftwomodes,theQuickStartModeandtheLowPower Mode.ThemodeselectionisexecutedusingtheLXTLPbitintheTBCregister. LXTLP Bit LXT Mode 0 Qui�k Sta�t 1 Low-powe� Afterpoweron,theLXTLPbitwillbeautomaticallyclearedtozeroensuringthattheLXToscillator isintheQuickStartoperatingmode.IntheQuickStartModetheLXToscillatorwillpowerup andstabilisequickly.However,aftertheLXToscillatorhasfullypoweredupitcanbeplaced intotheLow-powermodebysettingtheLXTLPbithigh.Theoscillatorwillcontinuetorunbut withreducedcurrentconsumption,asthehighercurrentconsumptionisonlyrequiredduringthe LXToscillatorstart-up.Inpowersensitiveapplications,suchasbatteryapplications,wherepower consumptionmustbekepttoaminimum,itisthereforerecommendedthattheapplicationprogram setstheLXTLPbithighabout2secondsafterpower-on. Itshouldbenotedthat,nomatterwhatconditiontheLXTLPbitissetto,theLXToscillatorwill alwaysfunctionnormallyandtheonlydifferenceisthatitwilltakemoretimetostartupifinthe Low-powermode. External Oscillator – EC Thesystemclockcanalsobesuppliedbyanexternallysuppliedclockgivingusersamethodof synchronisingtheirexternalhardwaretothemicrocontrolleroperation.Thisisselectedusing aconfigurationoptionandsupplyingtheclockonpinOSC1.PinOSC2shouldbeleftfloating iftheexternaloscillatorisused.Theinternaloscillatorcircuitcontainsafiltercircuittoreduce thepossibilityoferraticoperationduetonoiseontheoscillatorpin,howeverasthefiltercircuit consumesacertainamountofpower,aoscillatorconfigurationoptionexiststoturnthisfilteroff. Notusingtheinternalfiltershouldbeconsideredinpowersensitiveapplicationsandwherethe externallysuppliedclockisofahighintegrityandsuppliedbyalowimpedancesource. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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