HT66F005 datasheet(45/109 Pages) HOLTEK

45 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

“

CLR WDT”Inst�uction

8-stage Divide�

WDT P�esca�e�

WE4~WE0 bits

WDTC Registe�

Reset MCU

LIRC

fLIRC

fS/�8

8-to-1 MUX

CLR

WS�~WS0

(fS/�8 ~ fS/�18)

WDT Time-out

(�8/fS ~ �18/fS)

Watchdog Timer

Reset and Initialisation

Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicecanbesetto

somepredeterminedconditionirrespectiveofoutsideparameters.Ahardwareresetwillofcourse

beautomaticallyimplementedafterthedeviceispowered-on,howeverthereareanumberofother

hardwareandsoftwareresetsourcesthatcanbeimplementeddynamicallywhenthedeviceis

running.

Reset Overview

Themostimportantresetconditionisafterpowerisfirstappliedtothemicrocontroller.Inthiscase,

internalcircuitrywillensurethatthemicrocontroller,afterashortdelay,willbeinawelldefined

stateandreadytoexecutethefirstprograminstruction.Afterthispower-onreset,certainimportant

internalregisterswillbesettodefinedstatesbeforetheprograminstructionscommenceexecution.

OneoftheseregistersistheProgramCounter,whichwillberesettozeroforcingthemicrocontroller

tobeginprogramexecutionfromthelowestProgramMemoryaddress.

Thedevicesprovideseveralresetsourcestogeneratetheinternalresetsignal,providingextended

MCUprotection.Thedifferenttypesofresetsarelistedintheaccompanyingtable.

No.

Reset Name

Abbreviation Indication Bit Register

Notes

1 Powe�-On Reset

POR

—

�uto gene�ated at �owe� on

� Low-Vo�tage Reset

LVR

LRF

CTRL Low VDD vo�tage

3 Watchdog Reset

WDT

ST�TUS

—

4 WTDC Registe� Setting

Softwa�e Reset

—

WRF

CTRL W�ite to WTDC �egiste�

Reset Source Summary

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