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HT48R002 データシート(PDF) 25 Page - Holtek Semiconductor Inc |
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HT48R002 データシート(HTML) 25 Page - Holtek Semiconductor Inc |
25 / 71 page Rev. 1.11 24 April 11, 2017 Rev. 1.11 25 April 11, 2017 HT48R002/HT48R003 Cost-Effective I/O 8-Bit OTP MCU HT48R002/HT48R003 Cost-Effective I/O 8-Bit OTP MCU Watchdog Timer TheWatchdogTimer,alsoknownastheWDT,isprovidedtopreventprogrammalfunctionsor sequencesfromjumpingtounknownlocations,duetocertainuncontrollableexternaleventssuchas electricalnoise. Watchdog Timer Clock Source TheWatchdogTimerclocksourceisprovidedbytheLIRCandthesystemclockfSYSwhichis sourcedfromtheHIRCoscillator.TheWatchdogTimersourceclockisthensubdividedbyaratio of28to215togivelongertimeouts,theactualvaluebeingchosenusingtheWS2~WS0bitsinthe WDTSregister.TheLIRCinternaloscillatorhasanapproximateperiodfrequencyof12kHzata supplyvoltageof5V.However,itshouldbenotedthatthisspecifiedinternalclockperiodcanvary withVDD,temperatureandprocessvariations. Watchdog Timer Control Registers WDTS Register Bit 7 6 5 4 3 2 1 0 Name — — — — — WS2 WS1 WS0 R/W — — — — — R/W R/W R/W POR — — — — — 1 1 1 Bit7~3 Unimplemented,readas“0” Bit2~0 WS2~WS0:WDTTime-outperiodselection 000:28/fS 001:29/fS 010:210/fS 011:211/fS 100:212/fS 101:213/fS 110:214/fS 111:215/fS ThesethreebitsdeterminethedivisionratiooftheWatchdogTimersourceclock, whichinturndeterminesthetimeoutperiod. WDTC Register Bit 7 6 5 4 3 2 1 0 Name WDTCLS1 WDTCLS0 WDTEN5 WDTEN4 WDTEN3 WDTEN2 WDTEN1 WDTEN0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 0 0 0 0 0 0 0 Bit7~6 WDTCLS1~WDTCLS0:WDT/Timerclocksource 00:fLIRC 01:fSYS/4 10:fSYS 11:fSYS Bit5~0 WDTEN5~WDTEN0:WDTenablecontrol 000000:Enable 101101:Disable Othervalues:MCUreset Whenthesebitsarechangedbytheenvironmentalnoisetoresetthemicrocontroller, theresetoperationwillbeactivatedafter2~3LIRCclockcycles. |
同様の部品番号 - HT48R002 |
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同様の説明 - HT48R002 |
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