HT66F005 datasheet(26/109 Pages) HOLTEK

26 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

TheZ,OV,ACandCflagsgenerallyreflectthestatusofthelatestoperations.

• Cissetifanoperationresultsinacarryduringanadditionoperationorifaborrowdoesnottake

placeduringasubtractionoperation;otherwiseCiscleared.Cisalsoaffectedbyarotatethrough

carryinstruction.

• ACissetifanoperationresultsinacarryoutofthelownibblesinaddition,ornoborrowfrom

thehighnibbleintothelownibbleinsubtraction;otherwiseACiscleared.

• Zissetiftheresultofanarithmeticorlogicaloperationiszero;otherwiseZiscleared.

• OVissetifanoperationresultsinacarryintothehighest-orderbitbutnotacarryoutofthe

highest-orderbit,orviceversa;otherwiseOViscleared.

• PDFisclearedbyasystempower-uporexecutingthe“CLRWDT”instruction.PDFissetby

executingthe“HALT”instruction.

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

setbyaWDTtime-out.

Inaddition,onenteringaninterruptsequenceorexecutingasubroutinecall,thestatusregisterwill

notbepushedontothestackautomatically.Ifthecontentsofthestatusregistersareimportantandif

thesubroutinecancorruptthestatusregister,precautionsmustbetakentocorrectlysaveit.

STATUS Register

Bit

Name

—

PDF

�C

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:Anoperationresultsinacarryduringanadditionoperationorifaborrowdoes

nottakeplaceduringasubtractionoperation

Cisalsoaffectedbyarotatethroughcarryinstruction.

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