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HT46R068B Datasheet(PDF) 33 Page - Holtek Semiconductor Inc |
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HT46R068B Datasheet(HTML) 33 Page - Holtek Semiconductor Inc |
33 / 135 page Rev. 1.50 3� �e���a�� 05� �015 Rev. 1.50 33 �e���a�� 05� �015 HT46R068B/HT46R069B Enhanced A/D 8-Bit OTP MCU HT46R068B/HT46R069B Enhanced A/D 8-Bit OTP MCU Wake-up Function Register – PAWK WhenthemicrocontrollerenterstheIdle/SleepMode,variousmethodsexisttowakethedeviceup andcontinuewithnormaloperation.OnemethodistoallowafallingedgeontheI/Opinstohavea wake-upfunction.ThisregisterisusedtoselectwhichPortAI/Opinsareusedtohavethiswake-up function. Pull-high Registers – PAPU, PBPU, PCPU, PDPU, PEPU, PFPU TheI/Opins,ifconfiguredasinputs,canhaveinternalpull-highresistorsconnected,whicheliminates theneedforexternalpull-highresistors.ThisregisterselectswhichI/Opinsareconnectedtointernal pull-highresistors. Software COM Register – SCOMC ThepinsPB0~PB3onPortBcanbeusedasSCOMlinestodriveanexternalLCDpanel.To implementthisfunction,theSCOMCregisterisusedtosetupthecorrectbiasvoltagesonthesepins. Oscillator Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest optimisationcanbeachievedintermsofspeedandpowersaving.Oscillatorselectionsandoperation areselectedthroughacombinationofconfigurationoptionsandregisters. System Oscillator Overview Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources forotherfunctionssuchastheWatchdogTimer,Timer/EventCounter,TimeBaseetc.Thesystem oscillatorcanbeprovidedfromachoiceofthreehighspeedoscillators,theHXT,ERCorHIRC oscillators,orasinglelowspeed,LXTcrystaloscillator.TheLIRCoscillatorisusedonlyasa WatchdogTimerclocksource. Type Name Freq. Pins Function Exte�nal C��stal HXT 400kHz~1�MHz OSC1/ OSC� High Speed S�stem Clock Exte�nal RC ERC 400kHz~1�MHz OSC1 High Speed S�stem Clock Inte�nal High� Speed RC HIRC 4� 8 o� 1�MHz — High Speed S�stem Clock Exte�nal Low Speed C��stal LXT 3�768Hz XT1/ XT� Low Speed S�stem Clock Clock so��ce fo�: Watchdog� Time Base� Time�/Event Co�nte�s 0/1 Clock/SPI/SPIA Inte�nal Low Speed RC LIRC 13kHz — Watchdog Time� Clock External Crystal/Resonator Oscillator – HXT ThesimpleconnectionofacrystalacrossOSC1andOSC2willcreatethenecessaryphaseshiftand feedbackforoscillation.However,forsomecrystalsandmostresonatortypes,toensureoscillation andaccuratefrequencygeneration,itisnecessarytoaddtwosmallvalueexternalcapacitors,C1and C2.TheexactvaluesofC1andC2shouldbeselectedinconsultationwiththecrystalorresonator manufacturer'sspecification. Foroscillatorstabilityandtominimisetheeffectsofnoiseandcrosstalk,itisimportanttoensure thatthecrystalandanyassociatedresistorsandcapacitorsalongwithinterconnectinglinesareall locatedasclosetotheMCUaspossible. |
Similar Part No. - HT46R068B_15 |
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Similar Description - HT46R068B_15 |
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