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HT45F12 bảng dữ liệu(PDF) 46 Page - Holtek Semiconductor Inc |
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HT45F12 bảng dữ liệu(HTML) 46 Page - Holtek Semiconductor Inc |
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46 / 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 Bit2~0 WS2 ~ WS0:SelectWDTTimeoutPeriod 000:28/fS 001:210/fS 010:212/fS 011:214/fS 100:215/fS 101:216/fS 110:217/fS 111:218/fS ThesethreebitsdeterminethedivisionratiooftheWatchdogTimersourceclock, whichinturndeterminesthetimeoutperiod. CTRL Register Bit 7 6 5 4 3 2 1 0 Na�e F�Y�ON — — — — LVRF LRF WRF R/W R/W — — — — R/W R/W R/W POR 0 — — — — x 0 0 Bit7 FSYSON:fSYSControlinIDLEMode Describeelsewhere. Bit6~3 Unimplemented,readas“0” Bit2 LVRF:LVRfunctionresetflag Describeelsewhere. Bit1 LRF:LVRControlregistersoftwareresetflag Describeelsewhere. Bit0 WRF:WDTControlregistersoftwareresetflag 0:Notoccur 1:Occurred Thisbitissetto1bytheWDTControlregistersoftwareresetandclearedbythe applicationprogram.Notethatthisbitcanonlybeclearedto0bytheapplication program. Watchdog Timer Operation TheWatchdogTimeroperatesbyprovidingadeviceresetwhenitstimeroverflows.Thismeans thatintheapplicationprogramandduringnormaloperationtheuserhastostrategicallyclearthe WatchdogTimerbeforeitoverflowstopreventtheWatchdogTimerfromexecutingareset.Thisis doneusingtheclearwatchdoginstructions.Iftheprogrammalfunctionsforwhateverreason,jumps toanunknownlocation,orentersanendlessloop,theseclearinstructionswillnotbeexecutedinthe correctmanner,inwhichcasetheWatchdogTimerwilloverflowandresetthedevice.AWatchdog TimerconfigurationoptiondeterminesiftheWatchdogTimerisalwaysenabledorifitisenabled usingtheapplicationprogram.WithregardtotheWatchdogTimerenable/disablefunction,thereare alsofivebits,WE4~WE0,intheWDTCregistertoofferadditionalenable/disableandresetcontrol oftheWatchdogTimer.IftheWDTconfigurationoptionhasselectedthattheWDTfunctionis alwaysenabled,thenWE4~WE0bitsstillhaveeffectontheWDTfunction.WhentheWE4~WE0 bitsvalueareequalto01010Bor10101B,theWDTfunctionisenabled.However,iftheWE4~WE0 bitsarechangedtoanyothervaluesexcept01010Band10101B,whichcouldbecausedbyadverse environmentalconditionssuchasnoise,itwillresetthemicrocontrollerafter2~3LIRCclock cycles.IftheWDTconfigurationoptionhasselectedthattheWDTfunctioniscontrolledusingthe applicationprogram,thentheWDTcontrolregisterbits,WE4~WE0,areusedtoenableordisable theWatchdogTimer.InthiscasetheWDTfunctionwillbedisabledwhentheWE4~WE0bitsare |
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