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What are pointer and index registers?

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What are pointer and index registers?

These registers contain the offsets Distances of a variable, label, or instruction from its base segment of data and instructions. The offset refers to the distance of a variable, label, or instruction from its base segment.

What are pointer registers?

Pointer Registers The pointer registers are 32-bit EIP, ESP, and EBP registers and corresponding 16-bit right portions IP, SP, and BP. There are three categories of pointer registers − Instruction Pointer (IP) − The 16-bit IP register stores the offset address of the next instruction to be executed.

How many index registers are available in 8086?

Registers and instructions The 8086 has eight more or less general 16-bit registers (including the stack pointer but excluding the instruction pointer, flag register and segment registers).

What are pointers in 8086?

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3) Pointers and Index Registers In 8086 Microprocessor, they usually store the offset through which the actual address is calculated. Instruction Pointer (IP): The instruction pointer usually stores the address of the next instruction that is to be executed. Apart from this, it also acts as an offset for CS register.

What are the registers in 8086?

The registers inside the 8086 are all 16 bits. They are split up into four categories: General Purpose, Index, Status & Control, and Segment. The four general purpose registers are the AX, BX, CX, and DX registers. AX – accumulator, and preferred for most operations.

Which are the pointers used in 8086?

3) Pointers and Index Registers

  • Instruction Pointer (IP): The instruction pointer usually stores the address of the next instruction that is to be executed.
  • Base Pointer (BP): The Base pointer stores the base address of the memory.
  • Stack Pointer (SP):
  • Source Index (SI):
  • Destination Index (DI):

What is index register in 8086 microprocessor?

DI – This is the destination index register. It is of 16 bits. It is used in the pointer addressing of data and as a destination in some string related operations. It’s offset is relative to extra segment.

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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.

What are the index registers in microprocessor?

An index register in a computer’s CPU is a processor register or assigned memory location used for modifying operand addresses during the run of a program. This proved useful for doing vector/array operations and in commercial data processing for navigating from field to field within records.

Which are the four categories of registers in 8086?

The registers inside the 8086 are all 16 bits. They are split up into four categories: General Purpose, Index, Status & Control, and Segment. The four general purpose registers are the AX, BX, CX, and DX registers.

What is the difference between pointers and index registers?

Briefly explain the Pointers and Index group of registers. – Stack pointer and base pointer are the two pointer registers whereas the Source index and Destination index are the index group of registers. – They are primarily used to store relative to segment registers the locations of offset addresses of memory locations.

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What are the different types of registers in 8086 microprocessor?

Types of registers in the 8086 Microprocessor. 1 1) General Purpose Registers. The use of general-purpose registers is to store temporary data. While the instructions are executed in the control 2 2) Segment Registers. 3 3) Pointers and Index Registers. 4 4) Flag or Status Register.

What is an instruction pointer in 8086 microprocessor?

Instruction Pointer (IP): The instruction pointer in the 8086 microprocessor acts as a program counter. It indicates to the address of the next instruction to be executed. The EU receives opcode of an instruction from the queue, decodes it and then executes it.

What is the number of address lines in 8086 microcontroller?

The BIU (Bus Interfacing Unit) contains four special purpose registers called as segment registers. These are Code Segment (CS) register, Stack Segment (SS) register, Extra Segment (ES) register and Data Segment (DS) register. All these are 16 bit registers. The number of address lines in 8086 is 20.

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