HT66F13 datasheet(28/173 Pages) HOLTEK

28 / 173 page

· PDF is cleared by a system power-up or executing the

²CLR WDT² instruction. PDF is set by

executing the

²HALT² instruction.

· TO is cleared by a system power-up or executing the

²CLR WDT² or ²HALT² instruction. TO is set

by a WDT time-out.

In addition, on entering an interrupt sequence or executing a subroutine call, the status register will not

be pushed onto the stack automatically. If the contents of the status registers are important and if the

subroutine can corrupt the status register, precautions must be taken to correctly save it.

STATUSRegister

Bit

Name

PDF

R/W

POR

²x² unknown

Bit7,6

Unimplemented,readas

²0²

Bit5

TO:WatchdogTime-Outflag

0:Afterpoweruporexecutingthe

²CLR WDT² or ²HALT² instruction

1:A watchdogtime-outoccurred.

Bit4

PDF:Powerdownflag

0:Afterpoweruporexecutingthe

²CLR WDT² instruction

1:Byexecutingthe

²HALT² 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,ornoborrowfromthe

highnibbleintothelownibbleinsubtraction

Bit0

C:Carryflag

0:nocarry-out

1:anoperationresultsinacarryduringanadditionoperationorifaborrowdoesnottakeplace

duringasubtractionoperation

C isalsoaffectedbyarotatethroughcarryinstruction.

HT66F13/HT66F14/HT66F15

EnhancedA/DFlashType MCU

Rev.1.10

February9,2011

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