During the execution of a program which gets initialized first? Explanation: For the execution of a process first the instruction is placed in the PC.

Which are the two phases to execute an instruction?

In a computer program we have seen that execution of every instruction consists of two parts – fetch phase and execution phase of the instruction.

Which of the register S of the processor?

A processor register (CPU register) is one of a small set of data holding places that are part of the computer processor. A register may hold an instruction, a storage address, or any kind of data (such as a bit sequence or individual characters). Some instructions specify registers as part of the instruction.

What is the interconnection between the registers and ALU is called as?

The registers,ALU and the interconnection between them are collectively called as: (a) Data path.

Which of the following are instruction execution cycle phases?

In a basic computer, each instruction cycle consists of the following phases: Instruction fetch: fetch instruction from memory Decode the instruction: what operation to be performed. Registers Involved In Each Instruction Cycle: Memory address registers(MAR) : It is connected to System Bus address lines.

The Fetch-Execute Cycle: What's Your Computer Actually Doing?

38 related questions found

Where are decoded instructions stored?

The instruction after obtained from the PC, is decoded and operands are fetched and stored in the IR. This set of Computer Organization and Architecture Multiple Choice Basic Operational Concept. The instruction after obtained from the PC, is decoded and operands are fetched and stored in the IR.

What are registers in a CPU and how they work during program execution?

In Computer Architecture, the Registers are very fast computer memory which are used to execute programs and operations efficiently. This does by giving access to commonly used values, i.e., the values which are in the point of operation/execution at that time.

Which interrupts can be initiated by an instruction?

A software interrupt is a type of interrupt that is caused either by a special instruction in the instruction set or by an exceptional condition in the processor itself.

Which registers can be used by programmers in their programs?

Accumulator: This is the most common register, used to store data taken out from the memory. General Purpose Registers: This is used to store data intermediate results during program execution. It can be accessed via assembly programming. Special Purpose Registers: Users do not access these registers.

Which component decides the order in which a set of instructions is executed?

The program counter stores the address of each instruction and tells the CPU in what order they should be carried out. When a program is being executed, the CPU performs the fetch-decode-execute cycle, which repeats over and over again until reaching the STOP instruction.

Why registers and memory are used for processing?

Registers hold the operands or instruction that CPU is currently processing. Memory holds the instructions and the data that the currently executing program in CPU requires. ... Register holds the small amount of data around 32-bits to 64-bits.

Are registers primary memory?

3 Answers. CPU registers are often counted as part of primary memory (since they are directly accessed by the CPU - see Wikipedia) and are often volatile, so it seems likely that the expected answer is (1).

What happens when a process requests for DMA transfer?

When the process requests for a DMA transfer? Explanation: The process requesting the transfer is paused and the operation is performed, meanwhile another process is run on the processor.

Which of the following register deals with sequencing the execution of instructions?

Program Counter: This register is used to sequence the execution of the instructions. The function of the program counter is to point to the memory address from which the next byte is to be fetched.

Which register is used to sequence the execution of the instructions *?

These are various registers required for execution of instruction : Program Counter (PC), Instruction Register (IR), Memory Buffer (or Data) Register (MBR or MDR), and Memory Address Register (MAR).

What are the interrupts which are initiated by an I O drive?

These are known as the 4 general categories of techniques that are commonly used in I/O interrupt.

• Multiple Interrupt Lines. As the name suggests, we provide multiple interrupt lines between the processor and the I/O modules. ...
• Software Poll. ...
• Daisy Chain (Hardware Poll, Vectored) ...
• Bus Arbitration (Vectored)

Is the step during which a new instruction is read from the memory?

Fetch Stage: The next instruction is fetched from the memory address that is currently stored in the program counter and stored into the instruction register. At the end of the fetch operation, the PC points to the next instruction that will be read at the next cycle.

Which of the following is true about interrupts?

2. Which of the following is true? Explanation: All of the above mentioned statements are true i.e. interrupts are required to wake a CPU from sleep, same vector address associated with multiple flags and most of the interrupts are maskable.

What are the steps in the fetch execute cycle?

The fetch-execute cycle

1. The CPU fetches the instructions one at a time from the main memory into the registers. One register is the program counter (pc). ...
2. The CPU decodes the instruction.
3. The CPU executes the instruction.
4. Repeat until there are no more instructions.

Which register stores data before and after it has been processed by the ALU?

Typically, the ALU includes a register that it uses to store intermediate results of calculations. This register is known as the accumulator .

How do registers work in the CPU?

Registers: Temporary Storage Areas

Registers work under the direction of the control unit to accept, hold, and transfer instructions or data and perform arithmetic or logical comparisons at high speed.

What is the first step in the decoding of instruction?

the microprocessor uses its special circuit groups to carry out the three-step process:

1. Fetch: gets an instruction from memory.
2. Decode: decides what the instruction means.
3. Execute: performs the instruction.

How are instructions decoded?

To execute an instruction, the processor copies the instruction code from the program memory into the instruction register (IR). It can then be decoded (interpreted) by the instruction decoder, which is a combinational logic block which sets up the processor control lines as required.

What is decoding in microprocessor?

Address decoding refers to the way a computer system decodes the addresses on the address bus to select memory locations in one or more memory or peripheral devices.