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HT69F240 Datasheet(PDF) 48 Page - Holtek Semiconductor Inc |
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HT69F240 Datasheet(HTML) 48 Page - Holtek Semiconductor Inc |
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48 / 172 page  Rev. 1.20 48 �a��� 2�� 201� Rev. 1.20 49 �a��� 2�� 201� HT69F240 I/O 8-Bit Flash MCU with LED/LCD Driver HT69F240 I/O 8-Bit Flash MCU with LED/LCD Driver SMOD1 Register Bit 7 6 5 4 3 2 1 0 Name FSYSON — — — RSTF LVRF LRF WRF R/W R/W — — — R/W R/W R/W R/W POR 0 — — — 0 x 0 0 "x" unknown Bit7 FSYSON:fSYSControlinIDLEMode Describedelsewhere. Bit6~4 Unimplemented,readas"0" Bit3 RSTF:RSTCControlregistersoftwareresetflag Describedelsewhere. Bit2 LVRF:LVRfunctionresetflag Describedelsewhere. Bit1 LRF:LVRControlregistersoftwareresetflag Describedelsewhere. bit0 WRF:WDTControlregistersoftwareresetflag 0:Notoccurred 1:Occurred Thisbitissetto1bytheWDTControlregistersoftwareresetandclearedbythe applicationprogram.Notethatthisbitcanonlybeclearedto0bytheapplication program. Watchdog Timer Operation TheWatchdogTimeroperatesbyprovidingadeviceresetwhenitstimeroverflows.Thismeans thatintheapplicationprogramandduringnormaloperationtheuserhastostrategicallyclearthe WatchdogTimerbeforeitoverflowstopreventtheWatchdogTimerfromexecutingareset.Thisis doneusingtheclearwatchdoginstructions.Iftheprogrammalfunctionsforwhateverreason,jumps toanunknownlocation,orentersanendlessloop,theseclearinstructionswillnotbeexecutedinthe correctmanner,inwhichcasetheWatchdogTimerwilloverflowandresetthedevice.Withregardto theWatchdogTimerenable/disablefunction,therearefivebits,WE4~WE0,intheWDTCregister tooffertheadditionalenable/disablecontrolandresetcontroloftheWatchdogTimer.TheWDT functionwillbedisabledwhentheWE4~WE0bitsaresettoavalueof10101BwhiletheWDT functionwillbeenablediftheWE4~WE0bitsareequalto01010B.IftheWE4~WE0bitsaresetto anyothervalues,otherthan01010Band10101B,itwillresetthedeviceafter2~3fSUBclockcycles. Afterpoweronthesebitswillhaveavalueof01010B. WE4~WE0 Bits WDT Function 10101B Disable 01010B Enable Any ot�e� value Reset �CU Watchdog Timer Enable/Disable Control Undernormalprogramoperation,aWatchdogTimertime-outwillinitialiseadeviceresetandset thestatusbitTO.However,ifthesystemisintheSLEEPorIDLEMode,whenaWatchdogTimer time-outoccurs,theTObitinthestatusregisterwillbesetandonlytheProgramCounterandStack Pointerwillbereset.ThreemethodscanbeadoptedtoclearthecontentsoftheWatchdogTimer. ThefirstisaWDTreset,whichmeansacertainvalueexcept01010Band10101Bwrittenintothe WE4~WE0field,thesecondisusingtheWatchdogTimersoftwareclearinstructionandthethirdis viaaHALTinstruction. |
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