In 8085, which of the following performs : load register pair immediate…
2017
In 8085, which of the following performs : load register pair immediate operation ?
Answer: C. LXI rp, data — Answer: LXI rp, data Reason: LXI rp, data: loads a 16-bit immediate value into the specified register pair (BC, DE, HL, or SP). The two data bytes follow the…
- A.
LDAX rp
- B.
LHLD addr
- C.
LXI rp, data
- D.
INX rp
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Correct answer: C
Answer: LXI rp, data
Reason:
LXI rp, data: loads a 16-bit immediate value into the specified register pair (BC, DE, HL, or SP). The two data bytes follow the opcode and are placed into the pair.
Example: LXI H, 0x1234 loads 0x34 into L and 0x12 into H (immediate bytes follow the opcode).
Why the others are incorrect
LDAX rp: reads memory addressed by the register pair into the accumulator (memory -> A), not a load of a register pair with immediate data.
LHLD addr: loads H and L from two memory bytes at the specified address (memory -> HL). This is a direct memory read into HL, not loading immediate data embedded in the instruction.
INX rp: increments the register pair by one (rp = rp + 1). It modifies the pair arithmetically and does not load immediate data.