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CS:IP in 8086 Microprocessor


CS:IP in 8086

CS:IP in 8086 Microprocessor

Definition

CS:IP is used to locate the next instruction to be executed in memory.

Components

  • CS (Code Segment): Holds the base address of the code segment
  • IP (Instruction Pointer): Holds the offset of the instruction within the segment

Address Calculation

The physical address is calculated as:

Physical Address = (CS × 16) + IP

CS is shifted left by 4 bits (multiplied by 16), then IP is added.

Example

If:

  • CS = 2000H
  • IP = 3456H
Physical Address = 2000H × 10H + 3456H
= 20000H + 3456H
= 23456H

So, the instruction is fetched from memory location 23456H.

Importance

  • Determines the next instruction location
  • Automatically updates during execution
  • Essential for program control flow

Summary

  • CS: Segment (base address)
  • IP: Offset (location inside segment)
  • CS:IP: Complete memory address

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