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Resources » Articles/Knowledge Sharing » Computer & Technology »
Special Purpose Register in Microprocessor
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Hello Friends,
The special purpose registers are EIP , EFLAGS , CS , DS , ES , SS , ES & GS. The detail about special purpose registers are given below :-
1. EIP Register :- It is abbreviated as extended instruction pointer register. It can be addressed as EIP & IP. This register is addressed as IP , WHEN the microprocessor operates in the real mode & have 16 bits. This register is addressed as EIP , WHEN the microprocessor operates in the protected mode & have 32 bits. This register is mainly used for addressing the next instruction in the section of memory defined as code segment.
2. ESP Register :- It is abbreviated as extended stack pointer register. It can be addressed as SP ( 16 BIT ) Register & ESP ( 32 Bit ) register. This ESP register is mainly used for addressing an area of memory known as stack.
The stack memory stores data through this pointer.
3. EFLAGS :- FLAGS are mainly used for knowing the status of the microprocessor & control its operation. The flag register contains 16 bit from the 8086 to 80286 microprocessor & the 80386 and the above microprocessors contain 32 bit flag register.
The detail about flag register is given below :-
1. Carry (C) Flag :- The carry flag is set when there is a carry generated from addition process or a borrow generated from a subtraction process unless it is in reset condition.
2. Parity (P) Flag :- This flag tells us about the even parity & odd parity in a number. The parity flag is always in reset condition when there is a odd parity in a number. The parity flag is always in set condition when there is a even parity in a number.
3. Zero (Z) carry flag :- The zero flag tells us about the result of an arithmetic & logic operation. If the result of an arithmetic & logical operation is zero , then the zero flag is in set condition unless it is in reset condition.
4. Sign (S) Flag :- The sign flag tells us about the arithmetic sign of the result when the arithmetic & logical operation completes. It in the result , the MSB is 1 , then the sign flag is in set condition unless hugs in reset condition if the MSB is 0.
thanks,
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