What is instruction code in computer architecture?
An instruction code is a group of bits that instruct the computer to perform a specific operation. • The operation code of an instruction is a group of bits that define operations such as addition, subtraction, shift, complement, etc.
What are the different types of instruction codes?
There are three types of formats:
- Memory Reference Instruction. It uses 12 bits to specify the address and 1 bit to specify the addressing mode (I).
- Register Reference Instruction. These instructions are recognized by the opcode 111 with a 0 in the left most bit of instruction.
- Input-Output Instruction.
What is instruction code and instruction cycle?
A program consisting of the memory unit of the computer includes a series of instructions. The program is implemented on the computer by going through a cycle for each instruction. In the basic computer, each instruction cycle includes the following procedures − It can fetch instruction from memory.
What are the parts of instruction?
17. Instruction Components. Instruction in memory has two parts: opcode and operands. The operands are subjects of the operation, such as data values, registers, or memory addresses.
What are the different parts of an instruction?
Instruction in memory has two parts: opcode and operands.
What are the three types of instructions?
Depending on operation they perform, all instructions are divided in several groups: Arithmetic Instructions. Branch Instructions. Data Transfer Instructions.
What are the steps of instruction cycle?
The Instruction Cycle – Each phase of Instruction Cycle can be decomposed into a sequence of elementary micro-operations. In the above examples, there is one sequence each for the Fetch, Indirect, Execute and Interrupt Cycles. The Indirect Cycle is always followed by the Execute Cycle.
What are instructions in computer?
An instruction is an order given to a computer processor by a computer program.