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HT48R068B Datasheet(PDF) 35 Page - Holtek Semiconductor Inc |
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HT48R068B Datasheet(HTML) 35 Page - Holtek Semiconductor Inc |
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35 / 118 page  Rev. 1.30 34 �e���a�� 0�� �01� Rev. 1.30 3� �e���a�� 0�� �01� HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU Foroscillatorstabilityandtominimisetheeffectsofnoiseandcrosstalk,itisimportanttoensure thatthecrystalandanyassociatedresistorsandcapacitorsalongwithinterconnectinglinesareall locatedasclosetotheMCUaspossible. To i nt er nal ci rc ui ts In te rn al O sci ll at or Ci rc ui t C1 C2 Rp No te :1 . Rp , C 1 and C 2 ar e re qui r ed. 2. A lt hough not s how n pi ns h av e a par as it ic c apac it an ce o f ar ound 7pF . In te r nal R C O sc illa to r 32768H z External LXT Oscillator - HXT LXT Oscillator C1 and C2 Values Crystal Frequency C1 C2 3�768Hz 8p� 10p� Note: 1. C1 and C� val�es a�e fo� g�idance onl�. �. RP=�M~10M Ω is �ecommended. 32768Hz Crystal Recommended Capacitor Values LXT Oscillator Low Power Function TheLXToscillatorcanfunctioninoneoftwomodes,theQuickStartModeandtheLowPower Mode.ThemodeselectionisexecutedusingtheLXTLPbitintheCTRL0register. LXTLP Bit LXT Mode 0 Q�ick Sta�t 1 Low-powe� AfterpowerontheLXTLPbitwillbeautomaticallyclearedtozeroensuringthattheLXToscillator isintheQuickStartoperatingmode.IntheQuickStartModetheLXToscillatorwillpowerup andstabilisequickly.However,aftertheLXToscillatorhasfullypoweredupitcanbeplaced intotheLow-powermodebysettingtheLXTLPbithigh.Theoscillatorwillcontinuetorunbut withreducedcurrentconsumption,asthehighercurrentconsumptionisonlyrequiredduringthe LXToscillatorstart-up.Inpowersensitiveapplications,suchasbatteryapplications,wherepower consumptionmustbekepttoaminimum,itisthereforerecommendedthattheapplicationprogram setstheLXTLPbithighabout2secondsafterpower-on. Itshouldbenotedthat,nomatterwhatconditiontheLXTLPbitissetto,theLXToscillatorwill alwaysfunctionnormally,theonlydifferenceisthatitwilltakemoretimetostartupifintheLow- powermode. Internal Low Speed Oscillator – LIRC TheLIRCisafullyself-containedfreerunningon-chipRCoscillatorwithatypicalfrequency of13kHzat5Vrequiringnoexternalcomponents.WhenthedeviceenterstheIdle/SleepMode, thesystemclockwillstoprunningbuttheWDToscillatorcontinuestofree-runandtokeepthe watchdogactive.However,topreservepowerincertainapplicationstheLIRCcanbedisabledviaa configurationoption. |
Número de pieza similar - HT48R068B_15 |
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Descripción similar - HT48R068B_15 |
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