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operation code

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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.


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.

(programming)operation code - (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.


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The first digit is the operation code (op code) which determines what kind of action the computer should take, such as add, jump, load, or store.
Service Calendar - easy to use graphical look at all service drive interactions and schedules, including operation code level views
After AXI and AOI, the PT100 Parallel Tester can perform boundary-scan structural tests on 25-30 PCBs simultaneously, then in parallel download CPU based functional test code to the CPU's FLASH memory, have each CPU execute on-board functional tests simultaneously, capture the results and then in parallel, erase the FLASH and download, the product's real operation code," added Clark.
 
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