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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F4MA датащи(PDF) 46 Page - Holtek Semiconductor Inc |
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HT45F4MA датащи(HTML) 46 Page - Holtek Semiconductor Inc |
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46 / 145 page  Rev. 1.20 �� De�e��e� 1�� 201� Rev. 1.20 �7 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU Watchdog Timer TheWatchdogTimerisprovidedtopreventprogrammalfunctionsorsequencesfromjumpingto unknownlocations,duetocertainuncontrollableexternaleventssuchaselectricalnoise. Watchdog Timer Clock Source TheWatchdogTimerclocksourceisprovidedbytheinternalfSUBclockwhichisinturnsupplied bytheLIRCoscillator.TheWatchdogTimersourceclockisthensubdividedbyaratioof28to 218togivelongertimeouts,theactualvaluebeingchosenusingtheWS2~WS0bitsintheWDTC register.TheLIRCinternaloscillatorhasanapproximateperiodof32kHzatasupplyvoltageof5V. However,itshouldbenotedthatthisspecifiedinternalclockperiodcanvarywithVDD,temperature andprocessvariations. Watchdog Timer Control Register Asingleregister,WDTC,controlstherequiredtimeoutperiodaswellastheenable/disable operation.TheWDTCregisterisinitiatedto01010011Batanyresetbutkeepsunchangedatthe WDTtime-outoccurrenceinapowerdownstate. WDTC Register Bit 7 6 5 4 3 2 1 0 Na�e WE� WE3 WE2 WE1 WE0 WS2 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 10101or01010:Enabled Other:ResetMCU Whenthesebitsarechangedbytheenvironmentalnoisetoresetthemicrocontroller, theresetoperationwillbeactivatedafter2~3LIRCclockcyclesandtheWRFbitin theCTRLregisterwillbesetto1. Bit2~0 WS2~WS0:WDTTime-outperiodselection 000:28/fSUB 001:210/fSUB 010:212/fSUB 011:214/fSUB 100:215/fSUB 101:216/fSUB 110:217/fSUB 111:218/fSUB |
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