Machine Instructions and Addressing Modes

In a computer, the micro-operations are specified using a binary code called machine instruction. The Instruction code is a group of bits used to instruct the performance of a specific operation to the CPU. In instructions, the various ways in which the operand’s location is specified is called the addressing mode.

Machine Instruction and Addressing Modes for computer science revolve around various computer instructions and their format, and different types of programming modes. The Machine Instructions and Addressing Modes syllabus for GATE is from computer organisation and architecture - one of the important subjects for various competitive and government exams like GATE, ISRO, ESE, and other Computer Science exams.

Important Machine Instructions and Addressing Modes Topics for GATE CS

From the previous year Machine Instructions and Addressing Modes GATE questions, given below are the important Machine Instructions and Addressing Modes topics for GATE CS.

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1. Before starting with the preparation, go through the Machine Instructions and Addressing Modes GATE syllabus. This will help you understand what you are going to learn in this topic.
2. Check out the weightage of the subject to know the importance of the topic. For a GATE aspirant or any competitive exam, even a topic having less weightage should not be underestimated since even a single mark makes a major difference in the ranking.
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Importance of Machine Instructions and Addressing Modes for GATE

1. The instructions command the processor to let it know what it needs to do. The addressing mode interprets or modifies the instruction’s address field by specifying a rule before the operand is executed.
2. Machine Instructions and Addressing Modes is an important topic for the government and competitive exams like GATE, ISRO, ESE, and other CS exams.
3. Preparing Machine Instructions and Addressing Modes along with other topics from Computer Organization and Architecture subject will lead to 9% of your GATE syllabus coverage.
4. Every year, there’s a confirmed question from Machine Instructions and Addressing Modes, and hence you should be thorough with this topic.

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FAQs

Q: What are the steps in the instruction cycle?

A: Given below are the steps involved in instruction cycles.

1. Fetching an Instruction.
2. Decoding the instruction.
3. In case of indirect address, reading the effective address from memory.
4. Executing Instruction.
5. Giving results to the memory.

Q: What are the types of Instruction formats?

A: Three Address Instruction Format, Two Address Instruction Format, One Address Instruction Format, Zero Address Instruction Format.

Q: What are the different memory-based addressing modes?

A: Implied addressing mode, immediate addressing mode, direct register addressing mode, direct addressing mode, indirect addressing mode, relative addressing mode, indexed addressing mode.

Q: What is PC Relative Addressing mode?

A: This mode is used to access an instruction which is within the segment. Hence, there’s a requirement of only one offset address.

Q: What are the different types of instructions?

A: There are three types of instructions - Data Transfer Instructions, Data Manipulation Instructions, and Program Control Instructions