HT45FM2C datasheet(138/171 Pages) HOLTEK

138 / 171 page

Rev. 1.10

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Rev. 1.10

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HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

Preliminar�

MFI8 Register

Bit

Name

—

EPWF

LVDF

—

EPWE

LVDE

R/W

—

R/W

—

R/W

POR

—

Bit7~6

Unimplemented,readas"0"

Bit 5

EPWF:

DataEEPROMinterruptrequestflag

0:Norequest

1:Interruptrequest

Bit 4

LVDF:

LVDinterruptrequestflag

0:Norequest

1:Interruptrequest

Bit3~2

Unimplemented,readas"0"

Bit 1

EPWE:

DataEEPROMinterruptcontrol

0:Disable

1:Enable

Bit 0

LVDE:

LVDinterruptcontrol

0:Disable

1:Enable

Interrupt Operation

Whentheconditionsforaninterrupteventoccur,suchasaTMComparePorCompareAmatchor

A/Dconversioncompletionetc,therelevantinterruptrequestflagwillbeset.Whethertherequest

flagactuallygeneratesaprogramjumptotherelevantinterruptvectorisdeterminedbythecondition

oftheinterruptenablebit.Iftheenablebitissethighthentheprogramwilljumptoitsrelevant

vector;iftheenablebitiszerothenalthoughtheinterruptrequestflagissetanactualinterruptwill

notbegeneratedandtheprogramwillnotjumptotherelevantinterruptvector.Theglobalinterrupt

enablebit,ifclearedtozero,willdisableallinterrupts.

Whenaninterruptisgenerated,theProgramCounter,whichstorestheaddressofthenextinstruction

tobeexecuted,willbetransferredontothestack.TheProgramCounterwillthenbeloadedwitha

newaddresswhichwillbethevalueofthecorrespondinginterruptvector.Themicrocontrollerwill

thenfetchitsnextinstructionfromthisinterruptvector.Theinstructionatthisvectorwillusually

bea“JMP”whichwilljumptoanothersectionofprogramwhichisknownastheinterruptservice

routine.Hereislocatedthecodetocontroltheappropriateinterrupt.Theinterruptserviceroutine

mustbeterminatedwitha“RETI”,whichretrievestheoriginalProgramCounteraddressfrom

thestackandallowsthemicrocontrollertocontinuewithnormalexecutionatthepointwherethe

interruptoccurred.

Thevariousinterruptenablebits,togetherwiththeirassociatedrequestflags,areshowninthe

accompanyingdiagramswiththeirorderofpriority.Someinterruptsourceshavetheirown

individualvectorwhileotherssharethesamemulti-functioninterruptvector.Onceaninterrupt

subroutineisserviced,alltheotherinterruptswillbeblocked,astheglobalinterruptenablebit,

EMIbitwillbeclearedautomatically.Thiswillpreventanyfurtherinterruptnestingfromoccurring.

However,ifotherinterruptrequestsoccurduringthisinterval,althoughtheinterruptwillnotbe

immediatelyserviced,therequestflagwillstillberecorded.

Ifaninterruptrequiresimmediateservicingwhiletheprogramisalreadyinanotherinterruptservice

routine,theEMIbitshouldbesetafterenteringtheroutine,toallowinterruptnesting.Ifthestack

isfull,theinterruptrequestwillnotbeacknowledged,eveniftherelatedinterruptisenabled,until

theStackPointerisdecremented.Ifimmediateserviceisdesired,thestackmustbepreventedfrom

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