HT68F001 datasheet(21/55 Pages) HOLTEK

21 / 55 page

Rev. 1.01

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HT68F001

Cost-Effective Flash MCU

HT68F001

Cost-Effective Flash MCU

• TOisclearedbyasystempower-uporexecutingthe“CLRWDT”or“HALT”instruction.TOis

setbyaWDTtime-out.

Inaddition,onenteringaninterruptsequenceorexecutingasubroutinecall,thestatusregisterwill

notbepushedontothestackautomatically.Ifthecontentsofthestatusregistersareimportantandif

thesubroutinecancorruptthestatusregister,precautionsmustbetakentocorrectlysaveit.

STATUS Register

Bit

Name

—

T�

PDF

�V

R/W

—

R/W

P�R

—

“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:Anoperationresultsinacarryduringanadditionoperationorifaborrowdoes

nottakeplaceduringasubtractionoperation

Cisalsoaffectedbyarotatethroughcarryinstruction.

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