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HT45F5Q Datasheet(PDF) 44 Page - Holtek Semiconductor Inc |
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HT45F5Q Datasheet(HTML) 44 Page - Holtek Semiconductor Inc |
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44 / 114 page  Rev. 1.10 44 De�e��e� 1�� �01� Rev. 1.10 45 De�e��e� 1�� �01� HT45F5Q Charger Flash MCU HT45F5Q Charger Flash MCU Watchdog Timer TheWatchdogTimerisprovidedtopreventprogrammalfunctionsorsequencesfromjumpingto unknownlocations,duetocertainuncontrollableexternaleventssuchaselectricalnoise. Watchdog Timer Clock Source TheWatchdogTimerclocksourceisprovidedbytheinternalfLIRCclockwhichissuppliedbythe LIRCoscillator.TheWatchdogTimersourceclockisthensubdividedbyaratioof28to215togive longertimeouts,theactualvaluebeingchosenusingtheWS2~WS0bitsintheWDTCregister.The LIRCinternaloscillatorhasanapproximateperiodof32kHzatasupplyvoltageof5V.However,it shouldbenotedthatthisspecifiedinternalclockperiodcanvarywithVDD,temperatureandprocess variations.TheWDTcanbeenabled/disabledusingtheWDTCregister. Watchdog Timer Control Register Asingleregister,WDTC,controlstherequiredtimeoutperiodaswellastheenable/disable operation.TheWRFsoftwareresetflagwillbeindicatedintheSMOD1register.Theseregisters controltheoveralloperationoftheWatchdogTimer. 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:WDTdisable 01010:WDTenable Othervalues:ResetMCU Whenthesebitsarechangedtoanyothervaluesbytheenvironmentalnoisetoreset themicrocontroller,theresetoperationwillbeactivatedafter2~3LIRCclockcycles andtheWRFbitwillbesetto1toindicatetheresetsource. 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. SMOD1 Register Bit 7 6 5 4 3 2 1 0 Na�e FSYSON — — — RSTF LVRF — WRF R/W R/W — — — R/W R/W — R/W POR 0 — — — 0 x — 0 “x” unknown Bit7 FSYSON:fSYSControlinIDLEMode 0:Disable 1:Enable |
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