HT82B42R datasheet(14/86 Pages) HOLTEK

14 / 86 page

Rev. 1.00

October 27, 2011

Rev. 1.00

October 27, 2011

HT82B42R/HT82B42RE

I/O MCU with USB Interface

Fe tc h In s t. (P C)

Ex ec ut e In s t. ( PC -1 )

Fe tc h In s t. ( PC +1 )

Ex ec ut e In st . (P C)

Fe tc h In s t. (P C+ 2)

Ex ec ut e In st . ( PC +1 )

PC +1

PC +2

Os c ill at or C lo ck

(S ys te m Cl o ck)

Ph as e Cl o ck T 1

Pr og ra m Co un te r

Ph as e Cl o ck T 2

Ph as e Cl o ck T 3

Ph as e Cl o ck T 4

Pi pe li ni ng

System Clocking and Pipelining

Fe tc h In st . 1E xe cu te In s t. 1

Fe tc h In s t. 2

Fl us h Pi pe lin e

6 DE L AY:

MO V A, [1 2H ]

CA LL D EL AY

CP L [ 12H ]

NO P

Ex ec ut e In st . 2

Fe tc h In s t. 3

Fe tc h In s t. 6

Ex ec ut e In st . 6

Fe tc h In st . 7

Instruction Fetching

Whenexecutinginstructionsrequiringjumpstonon-consecutiveaddressessuchasajump

instruction,asubroutinecall,interruptorreset,etc.,themicrocontrollermanagesprogramcontrol

byloadingtherequiredaddressintotheProgramCounter.Forconditionalskipinstructions,once

theconditionhasbeenmet,thenextinstruction,whichhasalreadybeenfetchedduringthepresent

instructionexecution,isdiscardedandadummycycletakesitsplacewhilethecorrectinstructionis

obtained.

ThelowerbyteoftheProgramCounter,knownastheProgramCounterLowregisterorPCL,is

availableforprogramcontrolandisareadableandwriteableregister.Bytransferringdatadirectly

intothisregister,ashortprogramjumpcanbeexecuteddirectly,however,asonlythislowbyte

isavailableformanipulation,thejumpsarelimitedtothepresentpageofmemory,thatis256

locations.Whensuchprogramjumpsareexecuteditshouldalsobenotedthatadummycyclewill

beinserted.

ThelowerbyteoftheProgramCounterisfullyaccessibleunderprogramcontrol.Manipulatingthe

PCLmightcauseprogrambranching,soanextracycleisneededtopre-fetch.Furtherinformation

onthePCLregistercanbefoundintheSpecialFunctionRegistersection.

HT82B42R Datasheet(PDF) 14 Page - Holtek Semiconductor Inc

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