Logical Instructions in AVR Microcontroller
Last Updated :
24 Sep, 2020
Logical Instructions are the instructions which perform basic arithmetic operations such as AND, OR, XOR, etc. In AVR micro-controller, the destination operand is always a register.
The following table shows the logical instructions :
Instruction |
Operand |
Explanation |
Example |
AND |
D, S |
D = D AND S
Performs a AND operation on the operands
and stores the result in the left hand operand |
AND D, S |
ANDI |
D, k(constant) |
D = D AND k
Performs a AND operation on the operands
and stores the result in the left hand operand with the right hand operand being a constant |
ANDI D, k |
OR |
D, S |
D = D OR S
Performs a OR operation on the operands
and stores the result in the left hand operand |
OR D, S |
ORI |
D, k |
D = D OR k
Performs a OR operation on the operands
and stores the result in the left hand operand with the right hand operand being a constant |
ORI D, k |
EOR |
D, S |
D = D XOR S
Performs a EX-OR operation on the operands
and stores the result in the left hand operand |
EOR D, S |
COM |
D. |
D = 1’s complement of D
The complement action changes ‘1’s to ‘0’s
and ‘0’s to ‘1’s |
COM D |
NEG |
D |
D = 2’s complement of D
This instruction takes the 2’s complement |
NEG D |
CP |
D, S |
Compares D and S
This instruction is really a subtraction action.
The only difference is that the values of registers don’t change |
CP D, S |
CPI |
D, k |
Compares D and k
The only difference between CP an CPI is that
CPI has one of the operands as a constant |
CP D, k |
Note :
D and S are Destination and Source respectively. Both are registers. k is a constant.
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