Direction: The item consists of two statements, one labelled as 'Statement (I)' and the other as 'Statement (II)'. You are to examine these two statements carefully and select the answers to these items using the code given below.

Statement (I): Content in the flag register in 8085 microprocessor is read by PUSH PSW followed by POP instruction.

Statement (II): Content in the flag register in 8085 microprocessor is not able to read and store to any general purpose register.

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UPSC ESE (Prelims) Electronics and Telecommunication Engineering 19 Feb 2023 Official Paper
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  1. Both Statement (I) and Statement are individually true and Statement (II) is the correct explanation of Statement (I)
  2. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
  3. Statement (I) is true but Statement (II) is false
  4. Statement (I) is false but Statement (II) is true

Answer (Detailed Solution Below)

Option 3 : Statement (I) is true but Statement (II) is false
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Detailed Solution

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Here, statement 1 is true because, in the 8085 microprocessor, the content of the flag register is indeed read by the 'push psw' instruction, which pushes the Program Status Word (PSW) onto the stack, including the contents of the flag register.

Statement 2 is false because, the content in the flag register can be read and is stored in the stack, but it can also be manipulated by other instructions. It is not accurate to say that the content in the flag register cannot be read and stored to any general purpose register. An instruction like 'POP PSW' can retrieve the flag register's content from the stack and store it back in the psw. 

Here, option 3 is correct.

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