HT66F018 datasheet(39/154 Pages) HOLTEK

39 / 154 page

Rev. 1.70

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Rev. 1.70

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HT66F018

A/D Flash MCU with EEPROM

HT66F018

A/D Flash MCU with EEPROM

External LXT Oscillator

LXT Oscillator C1 and C2 Values

Crystal Frequency

3�.768kHz

10pF

Note: 1. C1 and C� values are for guidance onl�.

�. RP=5M~10MΩ is recommended.

32.768kHz Crystal Recommended Capacitor Values

LXT Oscillator Low Power Function

TheLXToscillatorcanfunctioninoneoftwomodes,theQuickStartModeandtheLowPower

Mode.ThemodeselectionisexecutedusingtheLXTLPbitintheTBCregister.

LXTLP Bit

LXT Mode

Quick Start

Low-power

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

selectedviaconfigurationoption.ItisafullyintegratedRCoscillatorwithatypicalfrequencyof

32kHzat5V,requiringnoexternalcomponentsforitsimplementation.Devicetrimmingduring

themanufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareused

toensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe

oscillationfrequencyareminimised.Asaresult,atapowersupplyof5Vandatatemperatureof

25°Cdegrees,thefixedoscillationfrequencyof32kHzwillhaveatolerancewithin10%.

Supplementary Oscillators

Thelowspeedoscillators,inadditiontoprovidingasystemclocksourcearealsousedtoprovidea

clocksourcetotwootherdevicefunctions.ThesearetheWatchdogTimerandtheTimeBaseInterrupts.

HT66F018 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc

HT66F018 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc

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