HT82B42R datasheet(37/86 Pages) HOLTEK

37 / 86 page

Rev. 1.00

October 27, 2011

Rev. 1.00

October 27, 2011

HT82B42R/HT82B42RE

I/O MCU with USB Interface

INTC1 Register

Bit

Name

―

SIF

―

ESII

R/W

―

R/W

―

R/W

POR

―

Bit7~5

Unimplemented,readas“0”

Bit4

SIF:SPIinterruptrequestflag

0:inactive

1:active

Bit3~1

Unimplemented,readas“0”

Bit0

ESII:SPIinterruptenable

0:disable

1:enable

Interrupt Operation

WhenaUSBinterruptoccurs,aSPIinsterrupttakesplace,oroneoftheTimer/EventCounters

overflow,iftheirappropriateinterruptenablebitisset,theProgramCounter,whichstoresthe

addressofthenextinstructiontobeexecuted,willbetransferredontothestack.TheProgram

Counterwillthenbeloadedwithanewaddresswhichwillbethevalueofthecorresponding

interruptvector.Themicrocontrollerwillthenfetchitsnextinstructionfromthisinterruptvector.

TheinstructionatthisvectorwillusuallybeaJMPstatementwhichwilljumptoanothersection

ofprogramwhichisknownastheinterruptserviceroutine.Hereislocatedthecodetocontrolthe

appropriateinterrupt.TheinterruptserviceroutinemustbeterminatedwithaRETIstatement,which

retrievestheoriginalProgramCounteraddressfromthestackandallowsthemicrocontrollerto

continuewithnormalexecutionatthepointwheretheinterruptoccurred.

Thevariousinterruptenablebits,togetherwiththeirassociatedrequestflags,areshowninthe

accompanyingdiagramwiththeirorderofpriority.

Onceaninterruptsubroutineisserviced,alltheotherinterruptswillbeblocked,astheEMIbitwill

beclearedautomatically.Thiswillpreventanyfurtherinterruptnestingfromoccurring.However,

ifotherinterruptrequestsoccurduringthisinterval,althoughtheinterruptwillnotbeimmediately

serviced,therequestflagwillstillberecorded.Ifaninterruptrequiresimmediateservicingwhilethe

programisalreadyinanotherinterruptserviceroutine,theEMIbitshouldbesetafterenteringthe

routine,toallowinterruptnesting.Ifthestackisfull,theinterruptrequestwillnotbeacknowledged,

eveniftherelatedinterruptisenabled,untiltheStackPointerisdecremented.Ifimmediateservice

isdesired,thestackmustbepreventedfrombecomingfull.

Au to ma ti ca ll y Cl ear ed by I SR

M anual ly S et o r Cl ear ed b y So ft wa re

US B In te rr up t

Re ques t Fl ag U SBF

EM I

P ri or it y

In te rr up t

Po llin g

Hi gh

Au to ma ti ca lly D is abl ed b y IS R

Ca n be E nab le d M anua lly

Ti me r/ Ev ent C oun te r 0 Ov er fl ow

In te rr up t Re ques t Fl ag T 0F

ET 0I

Lo w

Ti me r/ Ev ent C oun te r 1 Ov er fl ow

In te rr up t Re ques t Fl ag T 1F

ET 1I

EU I

SPI In te rr up t

Re ques t F la g SI F

ES II

Interrupt Structure

HT82B42R Datasheet(PDF) 37 Page - Holtek Semiconductor Inc

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