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An 8085 executes the following instructions:
2710 LXI H, 30A0 H
2713 DAD H
2414 PCHL
All addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.
Which of the following statements is correct?
- a)PC = 2715H, HL = 30A0H
- b)PC = 30A0H, HL = 2715H
- c)PC = 6140H, HL = 6140H
- d)PC = 6140H, HL = 2715H
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
An 8085 executes the following instructions:2710 LXI H, 30A0 H2713 DA...
To understand the correct answer, let's go through each instruction and its effect on the Program Counter (PC) and HL register pair.
1) 2710 LXI H, 30A0H:
- This instruction loads the immediate value 30A0H into the HL register pair.
- After execution, HL = 30A0H.
2) 2713 DAD H:
- This instruction adds the contents of the HL register pair to the contents of the HL register pair (i.e., HL + HL).
- After execution, HL = 30A0H + 30A0H = 6140H.
3) 2414 PCHL:
- This instruction transfers the contents of the HL register pair to the Program Counter (PC).
- After execution, PC = HL = 6140H.
Therefore, the correct statement is:
- PC = 6140H
- HL = 6140H
Explanation in detail:
1) LXI H, 30A0H:
- The LXI instruction is used to load an immediate 16-bit value into a register pair.
- In this case, the instruction LXI H, 30A0H loads the immediate value 30A0H into the HL register pair.
- This means the HL register pair will hold the value 30A0H after executing this instruction.
2) DAD H:
- The DAD instruction is used to add the contents of a register pair to the HL register pair.
- In this case, the instruction DAD H adds the contents of the HL register pair to the HL register pair itself (i.e., HL + HL).
- Since HL initially holds the value 30A0H, the addition will be 30A0H + 30A0H = 6140H.
- After executing this instruction, the HL register pair will hold the value 6140H.
3) PCHL:
- The PCHL instruction is used to transfer the contents of the HL register pair to the Program Counter (PC).
- In this case, the instruction PCHL transfers the contents of the HL register pair (which is 6140H) to the PC.
- After executing this instruction, the PC will hold the value 6140H.
Therefore, the correct answer is:
- PC = 6140H
- HL = 6140H
1) 2710 LXI H, 30A0H:
- This instruction loads the immediate value 30A0H into the HL register pair.
- After execution, HL = 30A0H.
2) 2713 DAD H:
- This instruction adds the contents of the HL register pair to the contents of the HL register pair (i.e., HL + HL).
- After execution, HL = 30A0H + 30A0H = 6140H.
3) 2414 PCHL:
- This instruction transfers the contents of the HL register pair to the Program Counter (PC).
- After execution, PC = HL = 6140H.
Therefore, the correct statement is:
- PC = 6140H
- HL = 6140H
Explanation in detail:
1) LXI H, 30A0H:
- The LXI instruction is used to load an immediate 16-bit value into a register pair.
- In this case, the instruction LXI H, 30A0H loads the immediate value 30A0H into the HL register pair.
- This means the HL register pair will hold the value 30A0H after executing this instruction.
2) DAD H:
- The DAD instruction is used to add the contents of a register pair to the HL register pair.
- In this case, the instruction DAD H adds the contents of the HL register pair to the HL register pair itself (i.e., HL + HL).
- Since HL initially holds the value 30A0H, the addition will be 30A0H + 30A0H = 6140H.
- After executing this instruction, the HL register pair will hold the value 6140H.
3) PCHL:
- The PCHL instruction is used to transfer the contents of the HL register pair to the Program Counter (PC).
- In this case, the instruction PCHL transfers the contents of the HL register pair (which is 6140H) to the PC.
- After executing this instruction, the PC will hold the value 6140H.
Therefore, the correct answer is:
- PC = 6140H
- HL = 6140H
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Community Answer
An 8085 executes the following instructions:2710 LXI H, 30A0 H2713 DA...
2710H LXI H, 30A0H ; Load 16 bit data 30A0 in HL pair
2713H DAD H ; 6140H → HL
2714H PCHL ; Copy the contents 6140H of HL in PC
Thus, after execution, the above instruction contents of PC and HL are same, that is 6140H.
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An 8085 executes the following instructions:2710 LXI H, 30A0 H2713 DAD H2414 PCHLAll addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.Which of the following statements is correct?a)PC = 2715H, HL = 30A0Hb)PC = 30A0H, HL = 2715Hc)PC = 6140H, HL = 6140Hd)PC = 6140H, HL = 2715HCorrect answer is option 'C'. Can you explain this answer?
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An 8085 executes the following instructions:2710 LXI H, 30A0 H2713 DAD H2414 PCHLAll addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.Which of the following statements is correct?a)PC = 2715H, HL = 30A0Hb)PC = 30A0H, HL = 2715Hc)PC = 6140H, HL = 6140Hd)PC = 6140H, HL = 2715HCorrect answer is option 'C'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about An 8085 executes the following instructions:2710 LXI H, 30A0 H2713 DAD H2414 PCHLAll addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.Which of the following statements is correct?a)PC = 2715H, HL = 30A0Hb)PC = 30A0H, HL = 2715Hc)PC = 6140H, HL = 6140Hd)PC = 6140H, HL = 2715HCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An 8085 executes the following instructions:2710 LXI H, 30A0 H2713 DAD H2414 PCHLAll addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.Which of the following statements is correct?a)PC = 2715H, HL = 30A0Hb)PC = 30A0H, HL = 2715Hc)PC = 6140H, HL = 6140Hd)PC = 6140H, HL = 2715HCorrect answer is option 'C'. Can you explain this answer?.
An 8085 executes the following instructions:2710 LXI H, 30A0 H2713 DAD H2414 PCHLAll addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.Which of the following statements is correct?a)PC = 2715H, HL = 30A0Hb)PC = 30A0H, HL = 2715Hc)PC = 6140H, HL = 6140Hd)PC = 6140H, HL = 2715HCorrect answer is option 'C'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about An 8085 executes the following instructions:2710 LXI H, 30A0 H2713 DAD H2414 PCHLAll addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.Which of the following statements is correct?a)PC = 2715H, HL = 30A0Hb)PC = 30A0H, HL = 2715Hc)PC = 6140H, HL = 6140Hd)PC = 6140H, HL = 2715HCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An 8085 executes the following instructions:2710 LXI H, 30A0 H2713 DAD H2414 PCHLAll addresses and constants are in Hex. Let PC be the contents of the program counter and HL be the contents of the HL register pair just after executing PCHL.Which of the following statements is correct?a)PC = 2715H, HL = 30A0Hb)PC = 30A0H, HL = 2715Hc)PC = 6140H, HL = 6140Hd)PC = 6140H, HL = 2715HCorrect answer is option 'C'. Can you explain this answer?.
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