Assembly - Instruction

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Instruction (Machine Language) in Assembly


The syntax of an instruction in assembly is as follow:

label: mnemonic [operandArgument{0,3}] [;comment]


  • A mnemonic is a reserved name for a class of instruction opcodes which have the same function.
  • The operands argument.
  • An optional comment

When two operands are present in an arithmetic or logical instruction, the right operand is the source and the left operand is the destination. Some assembly languages put the source and destination in reverse order.





The list of all instruction are found in the instruction set of the device.

Example: see Intel Instruction Interpretation

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