AND logic and instructions
Instruction format: AND destination, source
Instruction function: perform a bitwise logical AND operation on two operands, and the result is sent back to the destination operand, that is, destination ← destination ^ source
It is mainly used to retain some of the operands (and "1"), and to clear some bits (and "0").
For example, execute the following command
mov al, ff
and al, 0f
Result: ax = 0f
mov al, ff
and al, f0
Result: ax = f0
mov al, ff
and al, ff
Result: ax = ff
mov al, ff
and al, 00
Result: ax = 00
OR logic or instruction
Instruction format: OR destination, source
Instruction function: perform a bitwise logical OR operation on two operands, and the result is sent back to the destination operand, that is, destination ← destination V source
It is mainly used to keep some bits of the operand (OR with "0") and make some bits 1 (OR with "1").
For example, execute the following command
mov al, ff
oral, 0f
Result: ax = ff
mov al, 00
oral, 0f
Result: ax = 0f
mov al, ff
or al, 00
Result: ax = ff
mov al, 00
or al, 00
Result: ax = 00
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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