What do index registers do?

An index register is a circuit that receives, stores, and outputs instruction-changing codes in a computer. This circuit is also called an address register or a register of modifications. A register can hold an instruction, a storage address, or any kind of data.

What is the function of point register and index register?

The pointer registers contain the offset within a particular segment. The BP & SP registers holds the offsets within the data and stack segments respectively. The Index registers are used as general purpose registers as well as for holding the offset in case of indexed based and relative indexed addressing modes.

Which registers are used in program execution?

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 data does index register?

Most commonly, an index register holds the current offset of a memory location, with another register holding the base address, so the combination of the two registers creates a completed memory address.

How program can be executed through a computer system?

The CPU executes a program that is stored as a sequence of machine language instructions in main memory. It does this by repeatedly reading, or fetching, an instruction from memory and then carrying out, or executing, that instruction. The PC stores the address of the next instruction that the CPU should execute.

How programs are executed?

How Does a Program Run? The CPU runs instructions using a “fetch-execute” cycle: the CPU gets the first instruction in the sequence, executes it (adding two numbers or whatever), then fetches the next instruction and executes it, and so on.

Why do we need registers in a computer system?

Registers are a type of computer memory used to quickly accept, store, and transfer data and instructions that are being used immediately by the CPU. The computer needs processor registers for manipulating data and a register for holding a memory address.

What is a program counter register?

A program counter is a register in a computer processor that contains the address (location) of the instruction being executed at the current time. As each instruction gets fetched, the program counter increases its stored value by 1. A register is one of a small set of data holding places that the processor uses.