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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT67F488 датащи(PDF) 51 Page - Holtek Semiconductor Inc |
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HT67F488 датащи(HTML) 51 Page - Holtek Semiconductor Inc |
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51 / 171 page  Rev. 1.60 51 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM CTRL Register Bit 7 6 5 4 3 2 1 0 �a�e FSYSO� — — — FSUBF 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 FSUBF:FSUBCControlregistersoftwareresetflag Describedelsewhere. Bit2 LVRF:LVRfunctionresetflag Describedelsewhere. Bit1 LRF:LVRControlregistersoftwareresetflag Describedelsewhere. Bit0 WRF:WDTControlregistersoftwareresetflag 0:Notoccur 1:Occurred Thisbitissetto1bytheWDTControlregistersoftwareresetandclearedbythe applicationprogram.Notethatthisbitcanonlybeclearedto0bytheapplication program. Watchdog Timer Operation TheWatchdogTimeroperatesbyprovidingadeviceresetwhenitstimeroverflows.Thismeans thatintheapplicationprogramandduringnormaloperationtheuserhastostrategicallyclearthe WatchdogTimerbeforeitoverflowstopreventtheWatchdogTimerfromexecutingareset.Thisis doneusingtheclearwatchdoginstructions.Iftheprogrammalfunctionsforwhateverreason,jumps toanunknownlocation,orentersanendlessloop,theseclearinstructionswillnotbeexecutedinthe correctmanner,inwhichcasetheWatchdogTimerwilloverflowandresetthedevice.Withregard totheWatchdogTimerenable/disablefunction,therearealsofivebits,WE4~WE0,intheWDTC registertoofferadditionalenable/disableandresetcontroloftheWatchdogTimer.TheWDT functionwillbedisabledwhentheWE4~WE0bitsaresettoavalueof10101B.TheWDTfunction willbeenablediftheWE4~WE0bitsvalueisequalto01010B.IftheWE4~WE0bitsaresettoany othervaluesbytheenvironmentalnoiseorsoftwaresetting,except01010Band10101B,itwillreset thedeviceafteradelaytime,tSRESET.Afterpoweronthesebitswillhavethevalueof01010B. WE4 ~ WE0 Bits WDT Function 10101B Disa�le 01010B Ena�le Any othe� value Reset MCU Watchdog Timer Enable/Disable Control Undernormalprogramoperation,aWatchdogTimertime-outwillinitialiseadeviceresetandset thestatusbitTO.However,ifthesystemisintheSLEEPorIDLEMode,whenaWatchdogTimer time-outoccurs,theTObitinthestatusregisterwillbesetandonlytheProgramCounterandStack Pointerwillbereset.ThreemethodscanbeadoptedtoclearthecontentsoftheWatchdogTimer. ThefirstisaWDTreset,whichmeansacertainvalueexcept01010Band10101Bwrittenintothe WE4~WE0bitfiled,thesecondisusingtheWatchdogTimersoftwareclearinstructionsandthe thirdisviaaHALTinstruction. |
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