 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
HT69F240 датащи(PDF) 49 Page - Holtek Semiconductor Inc |
|
|
|||||||||||||||||||||||||||||
HT69F240 датащи(HTML) 49 Page - Holtek Semiconductor Inc |
|
|
49 / 172 page  Rev. 1.20 48 �a��� 2�� 201� Rev. 1.20 49 �a��� 2�� 201� HT69F240 I/O 8-Bit Flash MCU with LED/LCD Driver HT69F240 I/O 8-Bit Flash MCU with LED/LCD Driver ThereisonlyonemethodofusingsoftwareinstructiontocleartheWatchdogTimer.Thatistouse thesingle"CLRWDT"instructiontocleartheWDTcontents. Themaximumtimeoutperiodiswhenthe218divisionratioisselected.Asanexample,witha 32kHzLIRCoscillatorasitssourceclock,thiswillgiveamaximumwatchdogperiodofaround8 secondforthe218divisionratio,andaminimumtimeoutof7.8msforthe28divisionration. “ CLR WDT”Inst�u�tion 8-stage Divide� WDT P�es�ale� WE4~WE0 bits WDTC Registe� Reset �CU LXT fSUB fSUB/28 8-to-1 �UX CLR WS2~WS0 (fSUB/28 ~ fSUB/218) WDT Time-out (28/fSUB ~ 218/fSUB) LIRC � U X Low Speed Os�illato� Configu�ation option “ HALT”Inst�u�tion Watchdog Timer Reset and Initialisation Aresetfunctionisafundamentalpartofanymicrocontrollerensuringthatthedevicecanbeset tosomepredeterminedconditionirrespectiveofoutsideparameters.Themostimportantreset conditionisafterpowerisfirstappliedtothemicrocontroller.Inthiscase,internalcircuitrywill ensurethatthemicrocontroller,afterashortdelay,willbeinawelldefinedstateandreadyto executethefirstprograminstruction.Afterthispower-onreset,certainimportantinternalregisters willbesettodefinedstatesbeforetheprogramcommences.OneoftheseregistersistheProgram Counter,whichwillberesettozeroforcingthemicrocontrollertobeginprogramexecutionfromthe lowestProgramMemoryaddress. AnothertypeofresetiswhentheWatchdogTimeroverflowsandresetstheMCU.Alltypesofreset operationsresultindifferentregisterconditionsbeingsetup.Anotherresetexistsintheformofa LowVoltageReset,LVR,whereafullreset,isimplementedinsituationswherethepowersupply voltagefallsbelowacertainthreshold. Reset Functions Therearefourwaysinwhicharesetcanoccur. Power-on Reset Themostfundamentalandunavoidableresetistheonethatoccursafterpowerisfirstappliedtothe. AswellasensuringthattheProgramMemorybeginsexecutionfromthefirstmemoryaddress,a power-onresetalsoensuresthatcertainotherregistersarepresettoknownconditions.AlltheI/O portandportcontrolregisterswillpowerupinahighconditionensuringthatallpinswillbefirstset toinputs. VD D In te r nal R es et t RS TD + t SST Power-On Reset Timing Chart Note:tRSTDispower-ondelay,typicaltime=50ms |
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
