What are the functions of different segment registers?
What are the functions of different segment registers?
Segment registers
- Code segment Register: Starting address of the section of memory holding code.
- Data segment Register: Stores the starting address of data segment.
- Extra segment Register: Used by string instruction to hold destination data.
What is the code segment register?
The CS(code segment register) is used to address the code segment of the memory i.e a location in the memory where the code is stored. The IP(Instruction pointer) contains the offset within the code segment of the memory.
What are the names of the 4 segment register?
The 8086 has four special segment registers: cs, ds, es, and ss. These stand for Code Seg- ment, Data Segment, Extra Segment, and Stack Segment, respectively. These registers are all 16 bits wide.
What are the names of the 4 segment registers?
The 8086 has four special segment registers: cs, ds, es, and ss. These stand for Code Seg- ment, Data Segment, Extra Segment, and Stack Segment, respectively. These registers are all 16 bits wide. They deal with selecting blocks (segments) of main memory.
What are the names of the 4 segment registers Mcq?
Explanation: The six segment registers available in 80386 are CS, SS, DS, ES, FS and GS, out of which DS, ES, FS and GS are the four data segment registers.
How are segment registers used in a program?
Different segment registers are as follows: 1. Code segment (CS): It is used to store the base location of all executable instructions in the program. It is used with IP register to fetch program instruction from memory. 2. Data Segment (DS): It is used as the default base location for memory variables.
How big is an address or segment register?
Address or segment registers are used to store the address of memory blocks of the instruction being executed. These are four segment registers. These are CS, DS, ES and SS. The size of each register is two bytes.
Which is register stores the starting address of the code segment?
A 16-bit Code Segment register or CS register stores the starting address of the code segment. Data Segment − It contains data, constants and work areas. A 16-bit Data Segment register or DS register stores the starting address of the data segment. Stack Segment − It contains data and return addresses of procedures or subroutines.
When to use code segment and data segment?
Code segment (CS): It is used to store the base location of all executable instructions in the program. It is used with IP register to fetch program instruction from memory. 2. Data Segment (DS): It is used as the default base location for memory variables. It is used with DI or SI registers to refer to the data in memory.