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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT68F005 датащи(PDF) 43 Page - Holtek Semiconductor Inc |
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HT68F005 датащи(HTML) 43 Page - Holtek Semiconductor Inc |
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43 / 93 page  Rev. 1.00 4� ��to�e� ��� �01� Rev. 1.00 43 ��to�e� ��� �01� HT68F005/HT68F006 Enhanced I/O Flash Type MCU HT68F005/HT68F006 Enhanced I/O Flash Type MCU “ CLR WDT”Instruction 8-stage Divider WDT Prescaler WE4~WE0 bits WDTC Register Reset MCU LIRC fLIRC fLIRC/28 8-to-1 MUX CLR WS2~WS0 (fLIRC/28 ~ fLIRC/218) WDT Time-out (28/fLIRC ~ 218/fLIRC) Watchdog Timer Reset and Initialisation Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicescanbesetto somepredeterminedconditionirrespectiveofoutsideparameters.Ahardwareresetwillofcoursebe automaticallyimplementedafterthedevicesarepowered-on,howeverthereareanumberofother hardwareandsoftwareresetsourcesthatcanbeimplementeddynamicallywhenthedevicesare running. Reset Overview Themostimportantresetconditionisafterpowerisfirstappliedtothemicrocontroller.Inthiscase, internalcircuitrywillensurethatthemicrocontroller,afterashortdelay,willbeinawelldefined stateandreadytoexecutethefirstprograminstruction.Afterthispower-onreset,certainimportant internalregisterswillbesettodefinedstatesbeforetheprograminstructionscommenceexecution. OneoftheseregistersistheProgramCounter,whichwillberesettozeroforcingthemicrocontroller tobeginprogramexecutionfromthelowestProgramMemoryaddress. Thedevicesprovideseveralresetsourcestogeneratetheinternalresetsignal,providingextended MCUprotection.Thedifferenttypesofresetsarelistedintheaccompanyingtable. No. Reset Name Abbreviation Indication Bit Register Notes 1 Powe�-�n Reset P�R — — Auto gene�ated at powe� on � Low-Voltage Reset LVR LRF CTRL Low VDD voltage 3 Wat�hdog Reset WDT T� STATUS — 4 WTDC Registe� Setting Softwa�e Reset — WRF CTRL W�ite to WTDC �egiste� Reset Source Summary |
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