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What are the statuses of condition flags in logical and arithmetic instruction?

written 6.3 years ago by liviavaz • 230

modified 4.0 years ago by ninadsail • 10

microcontroller and applications

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written 6.3 years ago by liviavaz • 230

Arithmetic operations affect the flags such as carry flag (CF), overflow flag (OF) etc. in the PSW register and the logical instructions majorly affects the carry flag (CF). The following table shows exactly which instructions affect which flags from the program status register (PSW):

Instruction	CY	OV	AC
ADD	X	X	X
ADDC	X	X	X
SUBB	X	X	X
MUL	0	X
DIV	0	X
DA	X
RRC	X
RLC	X
SETB C	1
CLR C	0
CPL C	X
ANL C, bit	X
ANL C, /bit	X
ORL C,bit	X
ORL C, /bit	X
MOV C, bit	X
CJNE	X

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