Question
In 8085 microprocessor, which of the following are 2-byte instructions ?
A. MOV C, A
B. MVI A, 32H
C. LDA 2050H
D. JMP 2085H
E. ADD B
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
B Only
8085 Instruction Size Analysis
To determine which 8085 instructions are 2-byte, we need to analyze the size of each instruction based on its opcode and operands.
Identifying 2-Byte Instructions
The size of an instruction is determined by the number of bytes it occupies in memory. This includes the opcode byte and any immediate data or address bytes.
| Instruction | Type | Size (Bytes) | Explanation |
|---|---|---|---|
| A. MOV C, A | Register Transfer | $1$ byte | Opcode only. |
| B. MVI A, 32H | Immediate Load | $2$ bytes | Opcode + $1$ byte immediate data. |
| C. LDA 2050H | Memory Load (Direct) | $3$ bytes | Opcode + $2$ byte address. |
| D. JMP 2085H | Jump (Unconditional) | $3$ bytes | Opcode + $2$ byte address. |
| E. ADD B | Register Arithmetic | $1$ byte | Opcode only. |
Conclusion on 2-Byte Instructions
Based on the analysis:
- Instruction B, $MVI A, 32H$, is the only instruction that requires $2$ bytes.
Therefore, the correct option includes only instruction B.
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