HT66F002 datasheet(49/144 Pages) HOLTEK

49 / 144 page

Rev. 1.71

April 11, 2017

Rev. 1.71

April 11, 2017

HT66F002/HT66F0025/HT66F003/HT66F004

Cost-Effective A/D Flash MCU with EEPROM

HT66F002/HT66F0025/HT66F003/HT66F004

Cost-Effective A/D Flash MCU with EEPROM

Themaximumtime-outperiodiswhenthe215divisionratioisselected.Asanexample,witha32

kHzLIRCoscillatorasitssourceclock,thiswillgiveamaximumwatchdogperiodofaround1

secondforthe215divisionratio,andaminimumtimeoutof7.8msforthe28divisionration.

“

CLR WDT”Instruction

11-stage Divider

7-stage Divider

WE4~WE0 bits

WDTC Register

Reset MCU

LIRC

fLIRC

8-to-1 MUX

CLR

WS2~WS0

(fLIRC/21 ~ fLIRC/211)

WDT Time-out

(28/fLIRC ~ 215/fLIRC)

RES pin reset

“

HALT”Instruction

Watchdog Timer

Reset and Initialisation

Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicescanbeset

tosomepredeterminedconditionirrespectiveofoutsideparameters.Themostimportantreset

conditionisafterpowerisfirstappliedtothemicrocontroller.Inthiscase,internalcircuitrywill

ensurethatthemicrocontroller,afterashortdelay,willbeinawelldefinedstateandreadyto

executethefirstprograminstruction.Afterthispower-onreset,certainimportantinternalregisters

willbesettodefinedstatesbeforetheprogramcommences.OneoftheseregistersistheProgram

Counter,whichwillberesettozeroforcingthemicrocontrollertobeginprogramexecutionfromthe

lowestProgramMemoryaddress.

Inadditiontothepower-onreset,situationsmayarisewhereitisnecessarytoforcefullyapply

aresetconditionwhenthemicrocontrollerisrunning.Oneexampleofthisiswhereafterpower

hasbeenappliedandthemicrocontrollerisalreadyrunning,theRESlineisforcefullypulledlow.

Insuchacase,knownasanormaloperationreset,someofthemicrocontrollerregistersremain

unchangedallowingthemicrocontrollertoproceedwithnormaloperationaftertheresetlineis

allowedtoreturnhigh.

AnothertypeofresetiswhentheWatchdogTimeroverflowsandresetsthemicrocontroller.All

typesofresetoperationsresultindifferentregisterconditionsbeingsetup.Anotherresetexistsinthe

formofaLowVoltageReset,LVR,whereafullresetisimplementedinsituationswherethepower

supplyvoltagefallsbelowacertainthreshold.

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