Explain flag register of 80386Give suitable example

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Explain flag register of 80386.Give suitable example.-Microprocessors-Mumbai University-Sem 5-Dec 2016

Related to 80386 microprocessor.

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  1. Flag register is a part of EU (Execution Unit). It is a 16 bit register with each bit corresponding to a flip-flop.
  2. A flag is a flip-flop. It indicates some condition produced by the execution of an instruction. For example the zero flag (ZF) will set if the result of execution of an instruction is zero

The FLAGS register is the status register in Intel x86 microprocessors that contains the current state of the processor. This register is 16 bits wide. Its successors, the EFLAGS and RFLAGS registers, are 32 bits and 64 bits wide, respectively. The wider registers retain compatibility with their smaller predecessors.

The fixed bits at bit positions 1, 3 and 5, and carry, parity, adjust, zero and sign flags are inherited from an even earlier architecture, 8080. The adjust flag used to be called auxiliary carry bit in 8080 and half-carry bit in the Zilog Z80 architecture.


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