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HT46R0042 Arkusz danych(PDF) 24 Page - Holtek Semiconductor Inc

Numer części HT46R0042
Szczegółowy opis  Cost-Effective A/D 8-Bit OTP MCU
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Producent  HOLTEK [Holtek Semiconductor Inc]
Strona internetowa  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

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HT46R0042
Cost-Effective A/D 8-Bit OTP MCU
HT46R0042
Cost-Effective A/D 8-Bit OTP MCU
Watchdog Timer
TheWatchdogTimer,alsoknownastheWDT,isprovidedtopreventprogrammalfunctionsor
sequencesfromjumpingtounknownlocations,duetocertainuncontrollableexternaleventssuchas
electricalnoise.
Watchdog Timer Clock Source
TheWatchdogTimerclocksourceisprovidedbytheLIRCoscillator,thesystemclockfSYSand
itsdivisionclockfSYS/4,whicharesourcedfromtheHIRCoscillator.TheWatchdogTimersource
clockisthensubdividedbyaratioof28to215togivelongertimeouts,theactualvaluebeingchosen
usingtheWS2~WS0bitsintheWDTSregister.TheLIRCinternaloscillatorhasanapproximate
periodfrequencyof12kHzatasupplyvoltageof5V.However,itshouldbenotedthatthisspecified
internalclockperiodcanvarywithVDD,temperatureandprocessvariations.TheWDTcanbe
enabled/disabledusingtheWDTEN2~WDTEN0bitsintheWDTLVRCregister.
Watchdog Timer Control Registers
WDTS Register
Bit
7
6
5
4
3
2
1
0
Name
WS�
WS1
WS0
R/W
R/W
R/W
R/W
P�R
1
1
1
Bit7~3
Unimplemented,readas“0”
Bit2~0
WS2~WS0:WDTTime-outperiodselection
000:28/fS
001:29/fS
010:210/fS
011:211/fS
100:212/fS
101:213/fS
110:214/fS
111:215/fS
ThesethreebitsdeterminethedivisionratiooftheWatchdogTimersourceclock,
whichinturndeterminesthetimeoutperiod.
WDTLVRC Register
Bit
7
6
5
4
3
2
1
0
Name WDTCLS1 WDTCLS0 LVREN� LVREN1 LVREN0 WDTEN� WDTEN1 WDTEN0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
P�R
0
0
0
0
0
0
0
0
Bit7~6
WDTCLS1~WDTCLS0:WDT/Timer/PWM/Timebaseclocksource
00:fLIRC
01:fSYS/4
10:fSYS
11:fSYS
Bit5~3
LVREN2~LVREN0:LVRenablecontrol
000:Enable
101:Disable
Othervalues:MCUreset


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