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HT48R068B Folha de dados(PDF) 41 Page - Holtek Semiconductor Inc |
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HT48R068B Folha de dados(HTML) 41 Page - Holtek Semiconductor Inc |
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41 / 118 page  Rev. 1.30 40 �e���a�� 0�� �01� Rev. 1.30 41 �e���a�� 0�� �01� HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU HT48R068B/HT48R069B Enhanced I/O 8-Bit OTP MCU Reset Functions Therearefivewaysinwhichamicrocontrollerresetcanoccur,througheventsoccurringboth internallyandexternally: Power-on Reset Themostfundamentalandunavoidableresetistheonethatoccursafterpowerisfirstappliedto themicrocontroller.AswellasensuringthattheProgramMemorybeginsexecutionfromthefirst memoryaddress,apower-onresetalsoensuresthatcertainotherregistersarepresettoknown conditions.AlltheI/Oportandportcontrolregisterswillpowerupinahighconditionensuringthat allpinswillbefirstsettoinputs. AlthoughthemicrocontrollerhasaninternalRCresetfunction,iftheVDDpowersupplyrisetime isnotfastenoughordoesnotstabilisequicklyatpower-on,theinternalresetfunctionmaybe incapableofprovidingproperresetoperation.Forthisreasonitisrecommendedthatanexternal RCnetworkisconnectedtotheRESpin,whoseadditionaltimedelaywillensurethattheRESpin remainslowforanextendedperiodtoallowthepowersupplytostabilise.Duringthistimedelay, normaloperationofthemicrocontrollerwillbeinhibited.AftertheRESlinereachesacertain voltagevalue,theresetdelaytimetRSTDisinvokedtoprovideanextradelaytimeafterwhichthe microcontrollerwillbeginnormaloperation.TheabbreviationSSTinthefiguresstandsforSystem Start-upTimer. RE S VD D In te r nal R es et 0. 9 V DD t RS TD + t SST t RS TD + t SST Power-On Reset Timing Chart Note:tRSTDispower-ondelay,typicaltime=100ms FormostapplicationsaresistorconnectedbetweenVDDandtheRESpinandacapacitorconnected betweenVSSandtheRESpinwillprovideasuitableexternalresetcircuit.Anywiringconnectedtothe RESpinshouldbekeptasshortaspossibletominimiseanystraynoiseinterference. ForapplicationsthatoperatewithinanenvironmentwheremorenoiseispresenttheEnhancedReset Circuitshownisrecommended. RE S/ PA 7 0. 1~ 1 m F 10k W ~ 100k W VD D VS S 0. 01 m F* * V DD 1N 4148* 300 W * External RES Circuit Note:"*"ItisrecommendedthatthiscomponentisaddedESDprotection. "**"Itisrecommendedthatthiscomponentisaddedinenvironmentswherepowerlinenoise issignificant. MoreinformationregardingexternalresetcircuitsislocatedinApplicationNoteHA0075Eonthe Holtekwebsite. |
Nº de peça semelhante - HT48R068B_15 |
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Descrição semelhante - HT48R068B_15 |
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