RTUEE / EC / EEEYr 2024 · Sem 52024

Q5Microprocessor

Question

2 marks

Q.5. Explain the instruction LHLD of 8085 microprocessor.

Answer

LHLD (Load H and L registers Direct) is an 8085 instruction that loads the L register with the contents of a specified 16-bit memory address and the H register with the contents of the next memory address, effectively loading a 16-bit value from memory into the HL register pair.

LHLD (Load H and L registers Direct) is a 3-byte instruction in the 8085 instruction set with the format LHLD addr16, where addr16 is a 16-bit memory address specified in the instruction. Execution of this instruction copies the byte stored at the specified memory address into the L register (the low-order byte), and copies the byte stored at the next sequential memory address (addr16+1) into the H register (the high-order byte) — effectively loading a full 16-bit value from two consecutive memory locations directly into the HL register pair, commonly used to load a 16-bit pointer or data value from memory for subsequent use (e.g., as a memory address for indirect addressing via the M operand, or as a 16-bit data value for arithmetic operations).

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