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HT67F488 데이터시트(PDF) 40 Page - Holtek Semiconductor Inc

부품명 HT67F488
상세설명  TinyPowerTM A/D Flash MCU with LCD & EEPROM
PDF  171 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT67F488 데이터시트(HTML) 40 Page - Holtek Semiconductor Inc

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Rev. 1.60
40
�ove��e� ��� �016
HT67F488/HT67F489
TinyPowerTM A/D Flash MCU with LCD & EEPROM
LXT Oscillator Low Power Function
TheLXToscillatorcanfunctioninoneoftwomodes,theQuickStartModeandtheLowPower
Mode.ThemodeselectionisexecutedusingtheLXTLPbitintheFSUBCregister.
FSUBC Register
Bit
7
6
5
4
3
2
1
0
�a�e
LXTLP
FSUB6
FSUB5
FSUB4
FSUB3
FSUB�
FSUB1
FSUB0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
1
0
1
0
1
0
Bit7
LXTLP:LXTLowPowerControl
0:QuickStartMode
1:LowPowerMode
Bit6~0
FSUB6~FSUB0:fSUBclocksourceselection
0101010:LIRC
1010101:LXT
Others:MCUreset
Afterpoweron,theLXTLPbitwillbeautomaticallyclearedtozeroensuringthattheLXToscillator
isintheQuickStartoperatingmode.IntheQuickStartModetheLXToscillatorwillpowerup
andstabilisequickly.However,aftertheLXToscillatorhasfullypoweredupitcanbeplaced
intotheLow-powermodebysettingtheLXTLPbithigh.Theoscillatorwillcontinuetorunbut
withreducedcurrentconsumption,asthehighercurrentconsumptionisonlyrequiredduringthe
LXToscillatorstart-up.Inpowersensitiveapplications,suchasbatteryapplications,wherepower
consumptionmustbekepttoaminimum,itisthereforerecommendedthattheapplicationprogram
setstheLXTLPbithighabout2secondsafterpower-on.
Itshouldbenotedthat,nomatterwhatconditiontheLXTLPbitissetto,theLXToscillatorwill
alwaysfunctionnormally,theonlydifferenceisthatitwilltakemoretimetostartupifintheLow-
powermode.
Internal 32kHz Oscillator – LIRC
TheInternal32kHzSystemOscillatorisoneofthelowfrequencyoscillatorchoices,whichis
selectedviatheFSUBCregister.ItisafullyintegratedRCoscillatorwithatypicalfrequencyof
32kHzat5V,requiringnoexternalcomponentsforitsimplementation.Devicetrimmingduring
themanufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareused
toensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe
oscillationfrequencyareminimised.Asaresult,atapowersupplyof5Vandatatemperatureof
25°Cdegrees,thefixedoscillationfrequencyof32kHzwillhaveatolerancewithin10%.



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