Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Questions > LXI SP, 209FHMVI C, OOHPUSH B POPPSWRETQ.The ...
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LXI SP, 209FH
MVI C, OOH
PUSH B P
OPPSW
RET
Q.
The function of above subroutine is
- a)To reset the content of accumulator
- b)To reset all the flags
- c)To reset content of B
- d)To set the content of accumulator
Correct answer is option 'B'. Can you explain this answer?
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LXI SP, 209FHMVI C, OOHPUSH B POPPSWRETQ.The function of above subrout...
So function of above subroutine is to reset all the flags.
Most Upvoted Answer
LXI SP, 209FHMVI C, OOHPUSH B POPPSWRETQ.The function of above subrout...
Explanation:
The given subroutine can be analyzed as follows to determine its function:
1. LXI SP, 209FHMVI C:
- This instruction loads the immediate 16-bit data (209FHMVI C) into the stack pointer (SP) register. The stack pointer points to the top of the stack in the memory.
- This instruction is used to set up the stack for subroutine calls and push the return address onto the stack.
2. OOHPUSH B:
- This instruction is not a valid assembly instruction. It seems to be a typographical error or an incorrect instruction.
3. POP PSW:
- This instruction pops the contents of the stack into the accumulator (A) and the flags register (PSW).
- The flags register consists of various status flags such as the carry flag (CY), zero flag (Z), sign flag (S), etc.
- Popping the contents of the stack into the flags register resets all the flags to the values that were saved on the stack during a previous subroutine call.
4. RET:
- This instruction is used to return from a subroutine.
- It pops the return address from the stack and jumps to that address, which was pushed onto the stack during the subroutine call.
Conclusion:
Based on the analysis of the given subroutine, it can be concluded that the function of the subroutine is to reset all the flags. This is because the POP PSW instruction pops the contents of the stack into the accumulator and the flags register, effectively resetting the flags to their previous values. Therefore, the correct answer is option 'B' - to reset all the flags.
The given subroutine can be analyzed as follows to determine its function:
1. LXI SP, 209FHMVI C:
- This instruction loads the immediate 16-bit data (209FHMVI C) into the stack pointer (SP) register. The stack pointer points to the top of the stack in the memory.
- This instruction is used to set up the stack for subroutine calls and push the return address onto the stack.
2. OOHPUSH B:
- This instruction is not a valid assembly instruction. It seems to be a typographical error or an incorrect instruction.
3. POP PSW:
- This instruction pops the contents of the stack into the accumulator (A) and the flags register (PSW).
- The flags register consists of various status flags such as the carry flag (CY), zero flag (Z), sign flag (S), etc.
- Popping the contents of the stack into the flags register resets all the flags to the values that were saved on the stack during a previous subroutine call.
4. RET:
- This instruction is used to return from a subroutine.
- It pops the return address from the stack and jumps to that address, which was pushed onto the stack during the subroutine call.
Conclusion:
Based on the analysis of the given subroutine, it can be concluded that the function of the subroutine is to reset all the flags. This is because the POP PSW instruction pops the contents of the stack into the accumulator and the flags register, effectively resetting the flags to their previous values. Therefore, the correct answer is option 'B' - to reset all the flags.
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LXI SP, 209FHMVI C, OOHPUSH B POPPSWRETQ.The function of above subroutine isa) To reset the content of accumulatorb) To reset all the flagsc) To reset content of Bd) To set the content of accumulatorCorrect answer is option 'B'. Can you explain this answer?
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