전자부품 데이터시트 검색엔진 |
|
HT82B42R 데이터시트(PDF) 46 Page - Holtek Semiconductor Inc |
|
HT82B42R 데이터시트(HTML) 46 Page - Holtek Semiconductor Inc |
46 / 84 page Rev. 1.10 �6 �ove��e� 0�� �01� Rev. 1.10 �7 �ove��e� 0�� �01� HT82B42R/HT82B42RE I/O MCU with USB Interface Watchdog Timer TheWDTclocksourceisimplementedbyadedicatedRCoscillator(WDToscillator)orinstruction clock(systemclockdividedby4),enabledusingaconfigurationoption.Thistimerisdesignedto preventasoftwaremalfunctionorsequencejumpingtoanunknownlocationwithunpredictable results.IftheWatchdogTimerisdisabled,alltheexecutionsrelatedtotheWDTresultsinno operation. OncetheinternalWDToscillator(RCoscillatornormallywithaperiodof32μs)isselected,itisfirst dividedby256(8-stages)togetthenominaltime-outperiodofapproximately8.19ms.Thistime-out periodmayvarywithtemperature,VDDandprocessvariations.ByusingtheWDTprescaler,longer time-outperiodscanberealized.WritingdatatoWS2,WS1,WS0(bit2,1,0oftheWDTS)can givedifferenttime-outperiods.IfWS2,WS1,WS0areallequalto"1",thedivisionratioisupto 1:128,andthemaximumtime-outperiodis1.048s. IftheWDToscillatorisdisabled,theWDTclocksourcemaystillcomefromtheinstructionclock andoperateinthesamemannerexceptthatinthePowerdownModestatetheWDTmaystop countingandloseitsprotectingpurpose.InthissituationtheWDTlogiccanberestartedbyexternal logic.Thehighnibbleandbit3oftheWDTSarereservedforuserdefinedflags,whichcanbeused toindicatesomespecifiedstatus. Ifthedeviceoperatesinanoisyenvironment,usingtheon-chipRCoscillator(WDTOSC)is stronglyrecommended,sincetheHALTwillstopthesystemclock. 8- bi t Co unt er ( ¸ 256) 7- bi t Pr es ca le r 8- to -1 M UX WD T Ti me -o ut WS 0~ WS 2 WD T Cl o ck S ou rc e Cl ea r WD T Ty pe Co nf ig ur at io n Op ti on CL R WD T1 F la g CL R WD T2 F la g 1 or 2 In st ru ct i ons CL R CL R f SYS /4 WD T Os ci ll at or WD T Cl o ck S ou rc e Co nf ig ur at io n Op ti on Watchdog Timer WDTS Register Bit 7 6 5 4 3 2 1 0 �a�e WS7 ― ― ― WS3 WS� WS1 WS0 R/W R/W ― ― ― R/W R/W R/W R/W POR 1 0 0 0 0 1 1 1 Bit7 WS7:USBresetenablecontrolbit Describedelsewhere Bit6~4 Unimplemented,readas“0” Bit3 WS3:D+,andD-havea300K±50%ohmpull-highcontrolbit Describedelsewhere Bit2~0 WS2,WS1,WS0:WDTTime-outperiodselection 000:1:1 001:1:2 010:1:4 011:1:8 100:1:16 101:1:32 110:1:64 111:1:128 |
유사한 부품 번호 - HT82B42R_14 |
|
유사한 설명 - HT82B42R_14 |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 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 |