INDEX REGISTERS? Area of memory assigned to a processor. Can store addresses of elements of an array. Low level areas Of memory. Usually accessible though assembly language. #COMPUTER_ORGANIZATION_AND_ASSEMBLY_LANGUAGE

1. Index registers
BY:
U F

2. What are index registers?
Area of memory assigned to a processor.
Can store addresses of elements of an array.
Low level areas Of memory.
Usually accessible though assembly
language.

3. Why are they used?
Used for very fast counter for stepping
through memory address.
To keep track such as looping.
Holds current offset of a memory location.

4. What’s an offset ???
A process that specifies number of bytes
in memory
Starting at one point, moving by the
offset, seeing where you are now.

5. Types of index Registers
1. Source index :
Points to memory location in data
segment.
Its offset is relative to data segment.
16 bits memory.

6. 2. Destination index :
Same as source index.
String operations uses destination
index to access memory location.

7. 3. Stack Pointer:
Points at program stack.
Used in conjunction with stack segment for
accessing stack segment.
Points at top most item of stack.
Offset address is relative to stack segment.

8. 4. Base Pointer :
Points data in stack segment.
Unlike stack pointer we can use base
pointer to access data in other
segments.
Offset address is relative to base
segment.

9. 5. Instruction pointer register
It is a control register.
Holds location of next instruction in
pipeline.
 Increments itself after every
instruction.

10. 6. Flag Register:
 Holds current status of program.