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HT82B42R 데이터시트(PDF) 46 Page - Holtek Semiconductor Inc

부품명 HT82B42R
상세설명  I/O MCU with USB Interface
Download  84 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT82B42R 데이터시트(HTML) 46 Page - Holtek Semiconductor Inc

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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


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