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Consider the program given below :
1. MOV A, C
2. STC
3. CMC
4. DCR C
Let, the content of register C is 00 H initially and the above instructions are executed, then content of register C and flag register is respectively
  • a)
    00 H, remain same as previous
  • b)
    00 H, 85 H
  • c)
    FF H, 84 H
  • d)
    CY H, 84 H
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Consider the program given below :1. MOV A, C2. STC3. CMC4. DCR CLet,...
1. MOV A, C
2. STC
3. CMC
4. DCR C
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Most Upvoted Answer
Consider the program given below :1. MOV A, C2. STC3. CMC4. DCR CLet,...
Explanation:

MOV A, C - Move the content of register C to register A.
STC - Set the carry flag.
CMC - Complement the carry flag.
DCR C - Decrement the content of register C by one.

Initially, the content of register C is 00 H. Let's see the effect of each instruction on the content of register C and flag register.

MOV A, C - The content of register C (00 H) is moved to register A.
STC - The carry flag is set.
CMC - The carry flag is complemented. Now, the carry flag is reset.
DCR C - The content of register C is decremented by one. The content of register C is FF H.

Therefore, the final content of register C is FF H and the flag register is 84 H (carry flag is reset, auxiliary carry flag is set, zero flag is reset, sign flag is reset, parity flag is set).

Hence, the correct answer is option C.

Summary:

- Initially, the content of register C is 00 H.
- After executing the instructions, the content of register C becomes FF H.
- The flag register is 84 H (carry flag is reset, auxiliary carry flag is set, zero flag is reset, sign flag is reset, parity flag is set).
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Consider the program given below :1. MOV A, C2. STC3. CMC4. DCR CLet, the content of register C is 00 H initially and the above instructions are executed, then content of register C and flag register is respectivelya)00 H, remain same as previousb)00 H, 85 Hc)FF H, 84 Hd)CY H, 84 HCorrect answer is option 'C'. Can you explain this answer?
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Consider the program given below :1. MOV A, C2. STC3. CMC4. DCR CLet, the content of register C is 00 H initially and the above instructions are executed, then content of register C and flag register is respectivelya)00 H, remain same as previousb)00 H, 85 Hc)FF H, 84 Hd)CY H, 84 HCorrect answer is option 'C'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Consider the program given below :1. MOV A, C2. STC3. CMC4. DCR CLet, the content of register C is 00 H initially and the above instructions are executed, then content of register C and flag register is respectivelya)00 H, remain same as previousb)00 H, 85 Hc)FF H, 84 Hd)CY H, 84 HCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the program given below :1. MOV A, C2. STC3. CMC4. DCR CLet, the content of register C is 00 H initially and the above instructions are executed, then content of register C and flag register is respectivelya)00 H, remain same as previousb)00 H, 85 Hc)FF H, 84 Hd)CY H, 84 HCorrect answer is option 'C'. Can you explain this answer?.
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