Question:
The number of memory cycles required to execute the following 8085 instructions
I. STA 3000 H
II. LXI D, 3000 H
The number of memory cycles required to execute the following 8085 instructions
I. STA 3000 H
II. LXI D, 3000 H
I. STA 3000 H
II. LXI D, 3000 H
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In 8085, instructions like STA and LXI require different numbers of memory cycles depending on their operation (data transfer, address loading).
Updated On: May 5, 2025
- 4 for (I) and 4 for (II)
- 4 for (I) and 3 for (II)
- 3 for (I) and 3 for (II)
- 3 for (I) and 4 for (II)
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The Correct Option is B
Solution and Explanation
- **STA 3000 H** instruction requires 4 memory cycles: 1 for opcode fetch, 1 for memory address fetch, and 2 for data transfer.
- **LXI D, 3000 H** instruction requires 3 memory cycles: 1 for opcode fetch, and 2 for loading the 16-bit address.
Thus, the correct answer is option (2).
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