operation code


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operation code

[‚äp·ə′rā·shən ‚kōd]
(computer science)
A field or portion of a digital computer instruction that indicates which action is to be performed by the computer. Also known as command code.

operation code

(programming)
(Or "op code") The part or parts of a machine language instruction which determines what kind of action the computer should take, e.g. add, jump, load, store. In any particular instruction set certain fixed bit positions within the instruction word contain the op code, others give parameters such as the addresses or registers involved. For example, in a 32-bit instruction the most significant eight bits might be the op code giving 256 possible operations.

For some instruction sets, certain values in the fixed bit positions may select a group of operations and the exact operation may depend on other bits within instruction word or subsequent words.

When programming in assembly language, the op code is represented by a readable name called an instruction mnemonic.

operation code

The part of a machine instruction that tells the computer what to do, such as input, add or branch. The operation code is the verb; the operands are the nouns.
References in periodicals archive ?
If it fits to some predefined formats (see Figure 5), then SMS content reading module is called to read the content of SMS to store the phone number, locking password, and operation code. If the password is right, the SMS is intercepted by our sensor and is invisible to other applications.
In an operation code named Blue Monday, Whitehall officials and anti-terror experts met at the Foreign Office to work out ways of dealing with the threat of terror attacks.
Mr Turner said police officers from Merseyside had spent months observing the movements of a number of men as part of an operation code named McArthur.
So far, he said, the stock theft operation code named: 'Kgomokhumo' had covered parts of Ngwaketse, Barolong, Kweneng, Kgatleng, Ngwato and Tswapong areas.
As a part of operation code named OpIsrael, notorious hacking group Anonymous and similar collectives have in recent days been exchanging information, via social media and other websites, on Israeli the government and corporate websites they plan to target.

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