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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HT45F12 bảng dữ liệu(PDF) 47 Page - Holtek Semiconductor Inc |
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HT45F12 bảng dữ liệu(HTML) 47 Page - Holtek Semiconductor Inc |
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47 / 104 page  Rev. 0.00 4� �e�te��e� ��� �01� Rev. 0.00 47 �e�te��e� ��� �01� HT45F12 8-Bit Flash MCU with Op Amps & Comparators HT45F12 8-Bit Flash MCU with Op Amps & Comparators equalto10101BandenablediftheWE4~WE0bitsareequalto01010B.IftheWE4~WE0bitsare settoanyothervalues,otherthan01010Band10101B,itwillresetthedeviceafter2~3LIRCclock cycles.Afterpoweronthesebitswillhaveavalueof01010B. WDT Configuration Option WE4~WE0 Bits WDT Function Always Ena�led 01010B o� 10101B Ena�le Any othe� value Reset MCU A��lication P�og�a� Ena�led 10101B Disa�le 01010B Ena�le Any othe� value Reset MCU “x”: don’t ca�e. Watchdog Timer Enable/Disable Control Undernormalprogramoperation,aWatchdogTimertime-outwillinitialiseadeviceresetandset thestatusbitTO.However,ifthesystemisintheSLEEPorIDLEMode,whenaWatchdogTimer time-outoccurs,theTObitinthestatusregisterwillbesetandonlytheProgramCounterandStack Pointerwillbereset.Forsomelowpowerconsumptionapplications,itisrecommendedtodisable theWDTfunctionbeforeenteringthePowerdownMode.Threemethodscanbeadoptedtoclear thecontentsoftheWatchdogTimer.Thefirstisanexternalhardwarereset,thesecondisusingthe WatchdogTimersoftwareclearinstructionandthethirdisviaaHALTinstruction. ThereisonlyonemethodofusingsoftwareinstructiontocleartheWatchdogTimer.Thatistouse thesingle“CLRWDT”instructiontocleartheWDTcontents. Themaximumtimeoutperiodiswhenthe218divisionratioisselected.Asanexample,witha32 kHzLIRCoscillatorasitssourceclock,thiswillgiveamaximumwatchdogperiodofaround8 secondforthe218divisionratio,andaminimumtimeoutof7.8msforthe28divisionration. “ CLR WDT”Inst�uction 8-stage Divide� WDT P�escale� WE4~WE0 �its WDTC Registe� Reset MCU LIRC f� f�/�8 8-to-1 MUX CLR W��~W�0 (f�/�8 ~ f�/�18) WDT Ti�e-out (�8/f� ~ �18/f�) Watchdog Timer |
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