HT45F2020 datasheet(62/85 Pages) HOLTEK

62 / 85 page

Rev. 1.00

April 11, 2017

Rev. 1.00

April 11, 2017

HT45F2020/HT45F2022

Sound Effect Generator Flash MCU

HT45F2020/HT45F2022

Sound Effect Generator Flash MCU

Bit0

PTMPE:PTMComparatorPmatchinterruptcontrol

0:Disable

1:Enable

Interrupt Operation

Whentheconditionsforaninterrupteventoccur,suchasaTMComparatorPorComparatorA

matchetc.,therelevantinterruptrequestflagwillbeset.Whethertherequestflagactuallygenerates

aprogramjumptotherelevantinterruptvectorisdeterminedbytheconditionoftheinterruptenable

bit.Iftheenablebitissethighthentheprogramwilljumptoitsrelevantvector,iftheenablebitis

zerothenalthoughtheinterruptrequestflagissetanactualinterruptwillnotbegeneratedandthe

programwillnotjumptotherelevantinterruptvector.Theglobalinterruptenablebit,ifclearedto

zero,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

becomingfull.Incaseofsimultaneousrequests,theaccompanyingdiagramshowstheprioritythat

isapplied.Alloftheinterruptrequestflagswhensetwillwake-upthedeviceifitisinSLEEPor

IDLEMode,howevertopreventawake-upfromoccurringthecorrespondingflagshouldbeset

beforethedeviceisinSLEEPorIDLEMode.

Time Base

TBF

TBE

EMI

08H

EMI

10H

Interrupt

Name

Request

Flags

Enable

Bits

Master

Enable

Vector

EMI auto disabled

in ISR

Priority

High

Low

PTM P

PTMPF

PTMPE

PTM A

PTMAF

PTMAE

M. Funct

MFF

MFE

Interrupts contained within

Multi-Function Interrupts

xxE

Enable Bits

xxF

Request Flag, auto reset in ISR

Legend

xxF

Request Flag, no auto reset in ISR

Interrupt Scheme

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