Question

Explain the function of following instructions of Intel 8085:

L x I H, 2900 H

Answer 1

L x I H, 2900 H [LOAD REGISTER PAIR IMMEDIATE]

Format: LXI rp, addr

Addressing: Immediate

Group: Data transfer group

Bytes: 3 bytes

Flag: None

Comment: The byte 3 of instruction is moved into high order register (r_h) of register pair rp any byte 2 is moved into low order register (r₁) of register pair. The register pairs can be BC, DE, HL or SP. [SP (stack pointer) is not a valid register pair, but it can be used in LXI instruction]

Example: LXI H, 2900 H

This instruction will load H-L pair with 2900 H. 29 H will be loaded in high order register (H) and 00H will be loaded in low order register (L)