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HT45F77 Datasheet(PDF) 59 Page - Holtek Semiconductor Inc

Part # HT45F77
Description  Body Fat Scale Flash MCU
PDF  203 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F77 Datasheet(HTML) 59 Page - Holtek Semiconductor Inc

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Rev. 1.20
58
De�e��e� 1�� 201�
Rev. 1.20
59
De�e��e� 1�� 201�
HT45F77
Body Fat Scale Flash MCU
HT45F77
Body Fat Scale Flash MCU
Watchdog Timer
TheWatchdogTimerisprovidedtopreventprogrammalfunctionsorsequencesfromjumpingto
unknownlocations,duetocertainuncontrollableexternaleventssuchaselectricalnoise.
Watchdog Timer Clock Source
TheWatchdogTimerclocksourceisprovidedbytheinternalclock,fS,whichisinturnsuppliedby
oneoftwosourcesselectedbyconfigurationoption:fSUBorfSYS/4.ThefSUBclockcanbesourced
fromeithertheLXTorLIRCoscillators,againchosenviaaconfigurationoption.TheWatchdog
Timersourceclockisthensubdividedbyaratioof28to218togivelongertimeouts,theactualvalue
beingchosenusingtheWS2~WS0bitsintheWDTCregister.TheLIRCinternaloscillatorhas
anapproximateperiodof32kHzatasupplyvoltageof5V.However,itshouldbenotedthatthis
specifiedinternalclockperiodcanvarywithVDD,temperatureandprocessvariations.TheLXT
oscillatorissuppliedbyanexternal32.768kHzcrystal.TheotherWatchdogTimerclocksource
optionisthefSYS/4clock.
Watchdog Timer Control Register
Asingleregister,WDTC,controlstherequiredtimeoutperiodaswellastheenable/disable
operation.Thisregistertogetherwithseveralconfigurationoptionscontroltheoveralloperationof
theWatchdogTimer.
WDTC Register
Bit
7
6
5
4
3
2
1
0
Na�e
WE�
WE3
WE2
WE1
WE0
WS2
WS1
WS0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
1
0
1
0
0
1
1
Bit7~3
WE4~WE0:WDTfunctionsoftwarecontrol
IftheWDTconfigurationoptionis"alwaysenable":
10101or01010:Enable
Others:ResetMCU
IftheWDTconfigurationoptionis"controlledbytheWDTcontrolregister":
10101:Disable
01010:Enable
Others:ResetMCU
Whenthesebitsarechangedbytheenvironmentalnoiseorsoftwaresettingtoreset
themicrocontroller,theresetoperationwillbeactivatedafter2~3fSUBclockcycles
andtheWRFbitintheCTRLregisterwillbesethigh.
Bit2~0
WS2~WS0:WDTtime-outperiodselection
000:28/fS
001:210/fS
010:212/fS
011:214/fS
100:215/fS
101:216/fS
110:217/fS
111:218/fS



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