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HT45FM2C Datasheet(PDF) 47 Page - Holtek Semiconductor Inc |
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HT45FM2C Datasheet(HTML) 47 Page - Holtek Semiconductor Inc |
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47 / 171 page  Rev. 1.10 46 �a� �0� �01� Rev. 1.10 47 �a� �0� �01� HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU HT45FM2C Brushless DC Motor Flash Type 8-Bit MCU Preliminar� Watchdog Timer TheWatchdogTimerisprovidedtopreventprogrammalfunctionsorsequencesfromjumpingto unknownlocations,duetocertainuncontrollableexternaleventssuchaselectricalnoise. Watchdog Timer Clock Source TheWatchdogTimerclocksourceisprovidedbytheinternalclock,fS,whichcanbesourcedfrom theLIRCoscillator.TheWatchdogTimersourceclockisthensubdividedbyaratioof28 to 218 to givelongertimeouts,theactualvaluebeingchosenusingtheWS2~WS0bitsintheWDTCregister. TheLIRCinternaloscillatorhasanapproximateperiodof32kHzatasupplyvoltageof5V. However,itshouldbenotedthatthisspecifiedinternalclockperiodcanvarywithVDD,temperature andprocessvariations. Watchdog Timer Control Register Asingleregister,WDTC,controlstheoveralloperationoftheWatchdogTimer.Anyresetofthis device,theinitialvalueoftheWDTCisalways“01010011”,anditwillnotbechangedinPower DownMode. WDTC Register Bit 7 6 5 4 � � 1 0 Name 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 Bit 7~3 WE4~WE0 :WDToperation 10101or01010:Enable Othervalues:MCUreset(Resetwillbeactiveafter1~2LIRCclockfordebounce time.) IftheMCUresetcausedbytheWE[4:0]inWDTCsoftwarereset,theWRFflagof CTRLregisterwillbeset) Bit 2~0 WS2~WS0 :WDTtime-outperiodselection 000: 28/fS 001: 210/fS 010: 212/fS 011: 214/fS 100: 215/fS 101: 216/fS 110: 217/fS 111: 218/fS ThesethreebitsdeterminethedivisionratiooftheWatchdogTimersourceclock, whichinturndeterminesthetimeoutperiod. |
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