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HT45F2020 Datasheet(PDF) 33 Page - Holtek Semiconductor Inc

Part # HT45F2020
Description  Sound Effect Generator Flash MCU
PDF  85 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F2020 Datasheet(HTML) 33 Page - Holtek Semiconductor Inc

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Rev. 1.00
32
April 11, 2017
Rev. 1.00
33
April 11, 2017
HT45F2020/HT45F2022
Sound Effect Generator Flash MCU
HT45F2020/HT45F2022
Sound Effect Generator Flash MCU
Watchdog Timer
TheWatchdogTimerisprovidedtopreventprogrammalfunctionsorsequencesfromjumpingto
unknownlocations,duetocertainuncontrollableexternaleventssuchaselectricalnoise.
Watchdog Timer Clock Source
TheWatchdogTimerclocksourceisprovidedbytheinternalfLIRCclockwhichissuppliedbytheLIRC
oscillator.TheWatchdogTimersourceclockisthensubdividedbyaratioof28to215togivelonger
timeouts,theactualvaluebeingchosenusingtheWS2~WS0bitsintheWDTCregister.TheLIRC
internaloscillatorhasanapproximateperiodof32kHzatasupplyvoltageof5V.However,itshouldbe
notedthatthisspecifiedinternalclockperiodcanvarywithVDD,temperatureandprocessvariations.
Watchdog Timer Control Register
Asingleregister,WDTC,controlstherequiredtimeoutperiodaswellastheenable/disableandreset
MCUoperation.ThisregistercontrolstheoveralloperationoftheWatchdogTimer.
WDTC Register
Bit
7
6
5
4
3
2
1
0
Name
WE4
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
10101:Disable
01010:Enable
Othervalues:ResetMCU(TheresetoperationwillbeactivatedaftertSRESETtime.)
Whenthesebitsarechangedbytheenvironmentalnoiseorsoftwaresettingtoreset
themicrocontroller,theresetoperationwillbeactivatedafteradelaytime,tSRESET,and
theWRFbitintheRSTFCregisterwillbesetto1.
Bit2~0
WS2~WS0:WDTtime-outperiodselection
000:28/fLIRC
001:29/fLIRC
010:210/fLIRC
011:211/fLIRC
100:212/fLIRC
101:213/fLIRC
110:214/fLIRC
111:215/fLIRC
ThesethreebitsdeterminethedivisionratiooftheWatchdogTimersourceclock,
whichinturndeterminesthetimeoutperiod.
RSTFC Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
—
WRF
R/W
—
—
—
—
—
—
—
R/W
POR
—
—
—
—
—
—
—
0
Bit7~1
Unimplemented,readas“0”
Bit0
WRF:WDTcontrolregistersoftwareresetflag
0:Notoccurred
1:Occurred
Thisbitissetto1bytheWDTcontrolregistersoftwareresetandclearedbythe
applicationprogram.Notethatthisbitcanonlybeclearedto0bytheapplicationprogram.



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