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HT46R0042 Arkusz danych(PDF) 24 Page - Holtek Semiconductor Inc |
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HT46R0042 Arkusz danych(HTML) 24 Page - Holtek Semiconductor Inc |
24 / 83 page Rev. 1.00 �� ��to�e� ��� �01� Rev. 1.00 �5 ��to�e� ��� �01� HT46R0042 Cost-Effective A/D 8-Bit OTP MCU HT46R0042 Cost-Effective A/D 8-Bit OTP MCU Watchdog Timer TheWatchdogTimer,alsoknownastheWDT,isprovidedtopreventprogrammalfunctionsor sequencesfromjumpingtounknownlocations,duetocertainuncontrollableexternaleventssuchas electricalnoise. Watchdog Timer Clock Source TheWatchdogTimerclocksourceisprovidedbytheLIRCoscillator,thesystemclockfSYSand itsdivisionclockfSYS/4,whicharesourcedfromtheHIRCoscillator.TheWatchdogTimersource clockisthensubdividedbyaratioof28to215togivelongertimeouts,theactualvaluebeingchosen usingtheWS2~WS0bitsintheWDTSregister.TheLIRCinternaloscillatorhasanapproximate periodfrequencyof12kHzatasupplyvoltageof5V.However,itshouldbenotedthatthisspecified internalclockperiodcanvarywithVDD,temperatureandprocessvariations.TheWDTcanbe enabled/disabledusingtheWDTEN2~WDTEN0bitsintheWDTLVRCregister. Watchdog Timer Control Registers WDTS Register Bit 7 6 5 4 3 2 1 0 Name — — — — — WS� WS1 WS0 R/W — — — — — R/W R/W R/W P�R — — — — — 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. WDTLVRC Register Bit 7 6 5 4 3 2 1 0 Name WDTCLS1 WDTCLS0 LVREN� LVREN1 LVREN0 WDTEN� WDTEN1 WDTEN0 R/W R/W R/W R/W R/W R/W R/W R/W R/W P�R 0 0 0 0 0 0 0 0 Bit7~6 WDTCLS1~WDTCLS0:WDT/Timer/PWM/Timebaseclocksource 00:fLIRC 01:fSYS/4 10:fSYS 11:fSYS Bit5~3 LVREN2~LVREN0:LVRenablecontrol 000:Enable 101:Disable Othervalues:MCUreset |
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