ETIC 2230 Guia do Utilizador descarregar pdf (Página 44)

Rev. 1.10 44 November 14, 2014 Rev. 1.10 45 November 14, 2014

HT66FW2230

Wireless Charger A/D Flash 8-Bit MCU

“CLR WDT”Instruction

8-stage Divider WDT Prescaler

WE4~WE0 bits

WDTC

Reset MCU

SUB

8-to-1 MUX

CLR

WS2~WS0 WDT Time-out

SUB

~ 2

SUB

)

“HALT”Instruction

Watchdog Timer

Reset and Initialisation

Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicecanbeset

tosomepredeterminedconditionirrespectiveofoutsideparameters.Thereisanumberofother

hardwareandsoftwareresetsourcesthatcanbeimplementeddynamicallywhenthedeviceis

running.

Reset Overview

Themostimportantresetconditionisafterpowerisrstappliedtothemicrocontroller.Inthiscase,

internalcircuitrywillensurethatthemicrocontroller,afterashortdelay,willbeinawelldened

stateandreadytoexecutetherstprograminstruction.Afterthispower-onreset,certainimportant

internalregisterswillbesettodenedstatesbeforetheprogramcommences.Oneoftheseregisters

istheProgramCounter,whichwillberesettozeroforcingthemicrocontrollertobeginprogram

executionfromthelowestProgramMemoryaddress.

Thedeviceprovidesseveralresetsourcestogeneratetheinternalresetsignal,providingextended

MCUprotection.Thedifferenttypesofresetsarelistedintheaccompanyingtable.

Reset Name Abbreviation Indication Bit Register Notes

Power-On Reset POR — — Auto generated at power on

RSTC Register Setting

Software Reset

— ERSTF RSTFC Write to RSTC register

Low-Voltage Reset LVR LRF RSTFC Low V

voltage

Watchdog Reset WDT TO STATUS

WDT Time-out

WDTC Register Setting

Software Reset

— WRF RSTFC Write to WDTC register

MCD Reset — — — Missing Clock Detector

AnothertypeofresetiswhentheWatchdogTimeroverflowsandresetsthemicrocontroller.All

typesofresetoperationsresultindifferentregisterconditionsbeingsetup.Anotherresetexistsin

theformofaLowVoltageResetwhichisimplementedinsituationswherethepowersupplyvoltage

fallsbelowacertainthreshold.

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