HT45F56 datasheet(29/90 Pages) HOLTEK

29 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector Flash MCU

Internal High Speed RC Oscillator – HIRC

TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents.

TheinternalRCoscillatorhasafixedfrequencyof8MHz.Devicetrimmingduringthe

manufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareusedto

ensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe

oscillationfrequencyareminimised.Asaresult,atapowersupplyof5Vandatatemperatureof

25°Cdegrees,thefixedoscillationfrequencyof8MHzwillhaveatolerancewithin2%.

Internal 32kHz Oscillator – LIRC

TheInternal32kHzSystemOscillatoristhelowfrequencyoscillatorchoicesandfullyintegrated

withatypicalfrequencyof32kHzat5V,requiringnoexternalcomponentsforitsimplementation.

Devicetrimmingduringthemanufacturingprocessandtheinclusionofinternalfrequency

compensationcircuitsareusedtoensurethattheinfluenceofthepowersupplyvoltage,temperature

andprocessvariationsontheoscillationfrequencyareminimised.

Supplementary Oscillators

Thelowspeedoscillator,inadditiontoprovidingasystemclocksourceisalsousedtoprovide

aclocksourcetotwootherdevicefunctions.ThesearetheWatchdogTimerandtheTimeBase

Interrupts.

Operating Modes and System Clocks

Presentdayapplicationsrequirethattheirmicrocontrollershavehighperformancebutoftenstill

demandthattheyconsumeaslittlepoweraspossible,conflictingrequirementsthatareespecially

trueinbatterypoweredportableapplications.Thefastclocksrequiredforhighperformancewill

bytheirnatureincreasecurrentconsumptionandofcoursevice-versa,lowerspeedclocksreduce

currentconsumption.AsHoltekhasprovidedthesedeviceswithbothhighandlowspeedclock

sourcesandthemeanstoswitchbetweenthemdynamically,theusercanoptimisetheoperationof

theirmicrocontrollertoachievethebestperformance/powerratio.

System Clocks

ThedevicehasdifferentclocksourcesforboththeCPUandperipheralfunctionoperation.By

providingtheuserwithawiderangeofclockselectionsusingregisterprogramming,aclocksystem

canbeconfiguredtoobtainmaximumapplicationperformance.

ThemainsystemclockcancomefromeitherahighfrequencyfHorlowfrequencyfSUBsourceand

isselectedusingtheHLCLKandCKS2~CKS0bitsintheSMODregister.Thehighspeedsystem

clockissourcedfromtheHIRCoscillatorwhilethelowspeedsystemclocksourceissourced

fromtheinternalclockfSUB.Theotherchoice,whichisadividedversionofthehighspeedsystem

oscillatorhasarangeoffH/2~fH/64.

Thereisoneadditionalinternalclockfortheperipheralcircuits,theTimeBaseclock,fTBC.ThefTBC

clockissourcedfromtheLIRCoscillatorandusedasasourcefortheTimeBaseinterruptfunctions

andfortheTM.

HT45F56 Datasheet(PDF) 29 Page - Holtek Semiconductor Inc

HT45F56 Datasheet(HTML) 29 Page - Holtek Semiconductor Inc

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