Holtek HT66F30 User Manual

Rev. 2.50 42 June 22, 2017 Rev. 2.50 43 June 22, 2017
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
STATUS Register
Bit 7 6 5 4 3 2 1 0
Name — — TO PDF OV Z AC C
R/W — — R R R/W R/W R/W R/W
POR — — 0 0 x x x x
“x”: unknown
Bit7,6 Unimplemented,readas“0”
Bit5 TO:WatchdogTime-Outag
0:Afterpoweruporexecutingthe“CLRWDT”or“HALT”instruction
1:Awatchdogtime-outoccurred.
Bit4 PDF:Powerdownag
0:Afterpoweruporexecutingthe“CLRWDT”instruction
1:Byexecutingthe“HALT”instruction
Bit3 OV:Overowag
0:Nooverow
1:Anoperationresultsinacarryintothehighest-orderbitbutnotacarryoutofthe
highest-orderbitorviceversa
Bit2 Z:Zeroag
0:Theresultofanarithmeticorlogicaloperationisnotzero
1:Theresultofanarithmeticorlogicaloperationiszero
Bit1 AC:Auxiliaryag
0:Noauxiliarycarry
1:Anoperationresultsinacarryoutofthelownibblesinaddition,ornoborrow
fromthehighnibbleintothelownibbleinsubtraction
Bit0 C:Carryag
0:Nocarry-out
1:Anoperationresultsinacarryduringanadditionoperationorifaborrowdoes
nottakeplaceduringasubtractionoperation
Cisalsoaffectedbyarotatethroughcarryinstruction.

Holtek HT66F30 Specifications

General

Brand	Holtek
Model	HT66F30
Category	Computer Hardware
Language	English