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HT45R4U датащи(PDF) 77 Page - Holtek Semiconductor Inc

номер детали HT45R4U
подробное описание детали  TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R4U датащи(HTML) 77 Page - Holtek Semiconductor Inc

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Rev. 1.10
76
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Rev. 1.10
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HT45R4U
TinyPowerTM A/D Type
e-Banking ASSP OTP MCU with LCD
IDLE1 Mode
TheIDLE1ModeisenteredwhenanHALTinstructionisexecutedandwhentheIDLENbitinthe
SMODregisterishighandtheFSYSONbitintheWDTCregisterishigh.IntheIDLE1Modethe
systemoscillatorwillbeinhibitedfromdrivingtheCPUbutmaycontinuetoprovideaclocksource
tokeepsomeperipheralfunctionsoperationalsuchastheTimers.IntheIDLE1Mode,thesystem
oscillatorwillcontinuetorun,andthissystemoscillatormaybehighspeedorlowspeedsystem
oscillator.IntheIDLE1ModethefSUBclocksourcewillbeon.
Control Register
Aregisterpair,SMODandSMOD1,isusedforoverallcontroloftheinternalclockswithinthedevice.
SMOD Register
Bit
7
6
5
4
3
2
1
0
Name
CKS�
CKS1
CKS0
FSTEN
LTO
HTO
IDLEN
HLCLK
R/W
R/W
R/W
R/W
R/W
R
R
R/W
R/W
POR
0
0
0
0
0
0
1
1
Bit7
~5
CKS2~CKS0:ThesystemclockselectionwhenHLCLKis"0"
000:fSUB(fLXT)
001:fSUB(fLXT)
010:fH/64
011:fH/32
100:fH/16
101:fH/8
110:fH/4
111:fH/2
Thesethreebitsareusedtoselectwhichclockisusedasthesystemclocksource.
Inadditiontothesystemclocksource,whichisderivedfromtheLXToscillator,a
dividedversionofthehighspeedsystemoscillatorcanalsobechosenasthesystem
clocksource.
Bit4
FSTEN:FastWake-upControl(onlyforHXT)
0:Disable
1:Enable
ThisistheFastWake-upControlbitwhichdeterminesifthefSUBclocksourceis
initiallyusedafterthedevicewakesup.Whenthebitishigh,thefSUBclocksourcecan
beusedasatemporarysystemclocktoprovideafasterwakeuptimeasthefSUBclock
isavailable.
Bit3
LTO:Lowspeedsystemoscillatorreadyflag
0:Notready
1:Ready
Thisisthelowspeedsystemoscillatorreadyflagwhichindicateswhenthelowspeed
systemoscillatorisstableafterpoweronresetorawake-uphasoccurred.Theflag
willbelowwhenintheSLEEP0Modebutafterawake-uphasoccurred,theflagwill
changetoahighlevelafter1024clockcyclesastheLXToscillatorisused.
Bit2
HTO:Highspeedsystemoscillatorreadyflag
0:Notready
1:Ready
Thisisthehighspeedsystemoscillatorreadyflagwhichindicateswhenthehighspeed
systemoscillatorisstable.Thisflagisclearedto"0"byhardwarewhenthedeviceis
poweredonandthenchangestoahighlevelafterthehighspeedsystemoscillatoris
stable.Thereforethisflagwillalwaysbereadas"1"bytheapplicationprogramafter
devicepower-on.TheflagwillbelowwhenintheSLEEPorIDLE0Modebutafter
awake-uphasoccurred,theflagwillchangetoahighlevelafter1024clockcyclesif
theHXToscillatorisusedor15~16clockcyclesiftheHIRCoscillatorisused.


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