HT46R003B datasheet(21/76 Pages) HOLTEK

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HT46R003B

Cost-Effective A/D 8-bit OTP MCU

HT46R003B

Cost-Effective A/D 8-bit OTP MCU

Oscillator

Variousoscillatoroptionsoffertheuserawiderangeoffunctionsaccordingtotheirvarious

applicationrequirements.Theflexiblefeaturesoftheoscillatorfunctionsensurethatthebest

optimizationcanbeachievedintermsofspeedandpowersaving.

System Oscillator Overview

Inadditiontobeingthesourceofthemainsystemclocktheoscillatorsalsoprovideclocksources

fortheWatchdogTimerfunction,PWMfunction,Timer/EventcounterandTimeBase.

Type

Name

Freq.

Internal High Speed RC

HIRC

8MHz

Internal Low Speed RC

LIRC

1�kHz

Oscillator Types

System Clock Configurations

Thereisonesystemoscillatorimplementedinthedevice,internal8MHzRC,HIRC.Alsothereisan

internal12kHzRCoscillatorLIRCusedastheclocksourcefortheWDTfunction,PWMfunction,

Timer/EventcounterandTimeBase.Moredetailsaredescribedintheaccompanysections.

Internal RC Oscillator – HIRC

TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents.

TheinternalRCoscillatorhasthefrequencyof8MHz.Devicetrimmingduringthemanufacturing

processandtheinclusionofinternalfrequencycompensationcircuitisusedtoensurethatthe

influenceofthepowersupplyvoltage,temperatureandprocessvariationsontheoscillation

frequencyareminimized.Notethatthisinternalsystemclockoptionrequiresnoexternalpinsforits

operation.RefertotheA.C.Characteristicsformorefrequencyaccuracydetails.

Internal 12kHz Oscillator – LIRC

TheLIRCisafullyself-containedfreerunningon-chipRCoscillatorwithatypicalfrequencyof

12kHzat5V,requiringnoexternalcomponentsforitsimplementation.Whenthedeviceentersthe

SleepMode,thesystemclockwillstoprunningbuttheLIRCoscillatorcontinuestofree-runand

tokeepthewatchdogactive.However,topreservepowerincertainapplicationstheLIRCcanbe

disabledbydisablingtheWDTfunction,PWMfunction,Timer/EventcounterandTimeBaseinthe

haltmode.

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