Logical instructions in 8085 microprocessor

Logical instructions are the instructions which perform basic logical operations such as AND, OR, etc. In 8085 microprocessor, the destination operand is always the accumulator. Here logical operation works on a bitwise level.

Following is the table showing the list of logical instructions:

OPCODE OPERAND DESTINATION EXAMPLE
ANA R A = A AND R ANA B
ANA M A = A AND Mc ANA 2050
ANI 8-bit data A = A AND 8-bit data ANI 50
ORA R A = A OR R ORA B
ORA M A = A OR Mc ORA 2050
ORI 8-bit data A = A OR 8-bit data ORI 50
XRA R A = A XOR R XRA B
XRA M A = A XOR Mc XRA 2050
XRI 8-bit data A = A XOR 8-bit data XRI 50
CMA none A = 1’s compliment of A CMA
CMP R Compares R with A and triggers the flag register CMP B
CMP M Compares Mc with A and triggers the flag register CMP 2050
CPI 8-bit data Compares 8-bit data with A and triggers the flag register CPI 50
RRC none Rotate accumulator right without carry RRC
RLC none Rotate accumulator left without carry RLC
RAR none Rotate accumulator right with carry RAR
RAL none Rotate accumulator left with carry RAR
CMC none Compliments the carry flag CMC
STC none Sets the carry flag STC

In the table,
R stands for register
M stands for memory
Mc stands for memory contents

Read related post: Arithmetic instructions in 8085 microprocessor

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