what is instruction formats
Instruction format. Introduction. The instruction format of an instruction is usually depicted in a rectangular box symbolizing the bits of the instruction as they appear in memory words or in a control register. An instruction format defines the layout of the bits of an instruction, in terms of its constituent parts. The bits of an instruction are divided into groups called fields. The most common fields found in instruction formats are: â¢ An operation code field that specifies the operation to be performed.