HT82B42R datasheet(24/86 Pages) HOLTEK

24 / 86 page

Rev. 1.00

October 27, 2011

Rev. 1.00

October 27, 2011

HT82B42R/HT82B42RE

I/O MCU with USB Interface

STATUS Register

Bit

Name

—

PDF

R/W

—

R/W

POR

—

“x” unknown

Bit7,6

Unimplemented,readas“0”

Bit5

TO:WatchdogTime-Outflag

0:afterpoweruporexecutingthe“CLRWDT”or“HALT”instruction

1:awatchdogtime-outoccurred

Bit4

PDF:Powerdownflag

0:afterpoweruporexecutingthe“CLRWDT”instruction

1:byexecutingthe“HALT”instruction

Bit3

OV:Overflowflag

0:nooverflow

1:anoperationresultsinacarryintothehighest-orderbitbutnotacarryoutofthe

highest-orderbitorviceversa

Bit2

Z:Zeroflag

0:theresultofanarithmeticorlogicaloperationisnotzero

1:theresultofanarithmeticorlogicaloperationiszero

Bit1

AC:Auxiliaryflag

0:noauxiliarycarry

1:anoperationresultsinacarryoutofthelownibblesinaddition,ornoborrow

fromthehighnibbleintothelownibbleinsubtraction

Bit0

C:Carryflag

0:nocarry-out

1:anoperationresultsinacarryduringanadditionoperationorifaborrowdoesnot

takeplaceduringasubtractionoperation

Cisalsoaffectedbyarotatethroughcarryinstruction.

Bank Pointer – BP

TheSpecialPurposeDataMemoryisdividedintotwoBanks,Bank0andBank1.TheUSBcontrol

registersarelocatedinBank1,whileallotherregistersarelocatedinBank0.TheBankPointer

selectswhichbankdataistobeaccessedfrom.IfBank0istobeaccessedthenBPmustbesettoa

valueof00H,whileifBank1istobeaccessedthenBPmustbesettoavalueof01H.

Ba nk P oi nt er

BP0

D at a Me mo ry

B an k 0

B an k 1

No t us ed , mu st b e re se t to " 0"

Bank Pointer

HT82B42R Datasheet(PDF) 24 Page - Holtek Semiconductor Inc

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