HT69F360 datasheet(75/235 Pages) HOLTEK

75 / 235 page

Rev. 1.30

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Rev. 1.30

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HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

Bit2~0

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.

SMOD1 Register

Bit

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—

LVRF

LRF

WRF

R/W

—

R/W

POR

—

“×”: unknown

Bit7~3

Unimplemented,readas“0”

Bit2

LVRF:LVRfunctionresetflag

Describeelsewhere

Bit1

LRF:LVRCregistersoftwareresetflag

Describeelsewhere

Bit0

WRF:WDTCregistersoftwareresetflag

0:Notoccurred

1:Occurred

Thisbitissetto1bytheWDTControlregistersoftwareresetandclearedbythe

applicationprogram.Notethatthisbitcanonlybeclearedto0bytheapplication

program.

Watchdog Timer Operation

TheWatchdogTimeroperatesbyprovidingadeviceresetwhenitstimeroverflows.Thismeans

thatintheapplicationprogramandduringnormaloperationtheuserhastostrategicallyclearthe

WatchdogTimerbeforeitoverflowstopreventtheWatchdogTimerfromexecutingareset.Thisis

doneusingtheclearwatchdoginstructions.Iftheprogrammalfunctionsforwhateverreason,jumps

toanunknownlocation,orentersanendlessloop,theseclearWDTinstructionswillnotbeexecuted

inthecorrectmanner,inwhichcasetheWatchdogTimerwilloverflowandresetthedevice.

WithregardtotheWatchdogTimerenable/disablefunction,therearefivebits,WE4~WE0,inthe

WDTCregistertoadditionalenable/disableandresetcontroloftheWatchdogTimer.TheWDT

functionwillbedisabledwhentheWE4~WE0bitsaresettoavalueof10101BwhiletheWDT

functionwillbeenablediftheWE4~WE0bitsareequalto01010B.IftheWE4~WE0bitsaresetto

anyothervalues,otherthan01010Band10101B,itwillresetthedeviceafter2~3fSUBclockcycles.

Afterpoweronthesebitswillhaveavalueof01010B.

Undernormalprogramoperation,aWatchdogTimertime-outwillinitialiseadeviceresetandset

thestatusbitTO.However,ifthesystemisintheSLEEPorIDLEMode,whenaWatchdogTimer

time-outoccurs,theTObitinthestatusregisterwillbesetandonlytheProgramCounterandStack

Pointerwillbereset.FourmethodscanbeadoptedtoclearthecontentsoftheWatchdogTimer.

ThefirstisaWDTreset,whichmeansavalueotherthan01010Band10101Bwrittenintothe

WE4~WE0field,thesecondisusingtheWatchdogTimersoftwareclearinstructions,thethirdisviaa

HALTinstructionandthefourthisanexternalhardwarereset,whichmeansalowlevelontheRESpin.

HT69F360 データシート(PDF) 75 Page - Holtek Semiconductor Inc

HT69F360 データシート(HTML) 75 Page - Holtek Semiconductor Inc

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