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HT45F5R Datasheet(PDF) 47 Page - Holtek Semiconductor Inc |
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HT45F5R Datasheet(HTML) 47 Page - Holtek Semiconductor Inc |
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47 / 138 page  Rev. 1.10 4� De�e��e� 1�� �01� Rev. 1.10 47 De�e��e� 1�� �01� HT45F5R Charger ASSP Flash MCU HT45F5R Charger ASSP Flash MCU Watchdog Timer TheWatchdogTimerisprovidedtopreventprogrammalfunctionsorsequencesfromjumpingto unknownlocations,duetocertainuncontrollableexternaleventssuchaselectricalnoise. Watchdog Timer Clock Source TheWatchdogTimerclocksourceisprovidedbytheinternalfLIRCclockwhichissuppliedbythe LIRCoscillator.TheWatchdogTimersourceclockisthensubdividedbyaratioof28to215togive longertimeouts,theactualvaluebeingchosenusingtheWS2~WS0bitsintheWDTCregister. TheLIRCinternaloscillatorhasanapproximatefrequencyof32kHzatasupplyvoltageof5V. However,itshouldbenotedthatthisspecifiedinternalclockperiodcanvarywithVDD,temperature andprocessvariations.TheWDTcanbeenabled/disabledusingtheWDTCregister. Watchdog Timer Control Register Asingleregister,WDTC,controlstherequiredtimeoutperiodaswellastheenable/disableand resetMCUoperation.TheWRFsoftwareresetflagwillbeindicatedintheRSTFCregister.These registerscontroltheoveralloperationoftheWatchdogTimer. WDTC Register Bit 7 6 5 4 3 2 1 0 Na�e WE4 WE� WE� WE1 WE0 WS� WS1 WS0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 1 0 1 0 0 1 1 Bit7~3 WE4 ~ WE0:WDTfunctionsoftwarecontrol 10101:Disable 01010:Enable Othervalues:ResetMCU Whenthesebitsarechangedbytheenvironmentalnoiseorsoftwaresettingtoreset themicrocontroller,theresetoperationwillbeactivatedafter2~3LIRCclockcycles andtheWRFbitintheRSTFCregisterwillbesetto1. Bit2~0 WS2 ~ WS0:WDTTime-outperiodselection 000:28/fLIRC 001:29/fLIRC 010:210/fLIRC 011:211/fLIRC(default) 100:212/fLIRC 101:213/fLIRC 110:214/fLIRC 111:215/fLIRC ThesethreebitsdeterminethedivisionratiooftheWatchdogTimersourececlock, whichinturndeterminesthetimeoutperiod. RSTFC Register Bit 7 6 5 4 3 2 1 0 Na�e — — — — — LVRF — WRF R/W — — — — — R/W — R/W POR — — — — — x — 0 "x": unknown Bit7~3 Unimplemented,readas"0" Bit2 LVRF:LVRfunctionresetflag Describedelsewhere. |
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