HT45F4M datasheet(105/138 Pages) HOLTEK

105 / 138 page

Rev. 1.10

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HT45F4M

Lithium Battery Backup Power ASSP MCU

HT45F4M

Lithium Battery Backup Power ASSP MCU

OVP Comparator Offset Cancellation Function

CMPallowsforacommodemodeadjustmentmethodofitsinputoffsetvoltage.

CBRS

CBOFM

OFF

Co mp ar at or B + i n put

Co mp ar at or B - i nput

Co mp ar at or B o ut pu t

CB OF 0~ CB OF 5, O VPEN

Thecalibrationstepsareasfollowing:

• SetCBOFM=1tosetuptheoffsetcancellationmode,hereS3isclosed

• SetCBRStoselectwhichinputpinistobeusedasthereferencevoltage–S1orS2isclosed

• AdjustCBOF0~CBOF5untiltheoutputstatuschanges

• SetCBOFM=0torestorethenormalComparatorBmode

Interrupts

Interruptsareanimportantpartofanymicrocontrollersystem.Whenanexternaleventoran

internalfunctionsuchasaTimerModuleoranA/Dconverterrequiresmicrocontrollerattention,

theircorrespondinginterruptwillenforceatemporarysuspensionofthemainprogramallowingthe

microcontrollertodirectattentiontotheirrespectiveneeds.Thedevicecontainsseveralexternal

interruptandinternalinterruptsfunctions.Theexternalinterruptisgeneratedbytheactionof

theexternalINT0andINT1pins,whiletheinternalinterruptsaregeneratedbyvariousinternal

functionssuchastheTMs,Comparator,TimeBase,LVD,EEPROMandtheA/Dconverter.

Interrupt Registers

Overallinterruptcontrol,whichbasicallymeansthesettingofrequestflagswhencertain

microcontrollerconditionsoccurandthesettingofinterruptenablebitsbytheapplicationprogram,

iscontrolledbyaseriesofregisters,locatedintheSpecialPurposeDataMemory,asshowninthe

accompanyingtable.Theregistersfallintothreecategories.ThefirstistheINTC0~INTC2registers

whichsetuptheprimaryinterrupts,thesecondistheMFI0~MFI2registerswhichsetuptheMulti-

functioninterrupts.FinallythereisanINTEGregistertosetuptheexternalinterrupttriggeredge

type.

Eachregistercontainsanumberofenablebitstoenableordisableindividualregistersaswellas

interruptflagstoindicatethepresenceofaninterruptrequest.Thenamingconventionofthese

followsaspecificpattern.Firstislistedanabbreviatedinterrupttype,thenthe(optional)numberof

thatinterruptfollowedbyeitheran“E”forenable/disablebitor“F”forrequestflag.

HT45F4M Datasheet(PDF) 105 Page - Holtek Semiconductor Inc

HT45F4M Datasheet(HTML) 105 Page - Holtek Semiconductor Inc

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