Data Transfer Instructions:

These instructions are used for transferring data items from one source location to another location called destination. The source can be an immediate number, content of a register or memory or even an input from the peripheral and destination can be a register, memory or any peripheral.

The different instructions under data transfer category are listed in table below:

1 MVI Reg/Mem,8-bit data Move immediate 8-bit data in reg/memory
2 MOV Rd, Rs Move content of source register to a destination register
3 MOV Rd, M Move content of memory to a destination register
4 LXI Rp,16-bit Data Move 16-bit immediate data to register pair (BC, DE, HL)
5 LDA 16-bit Address Load Accumulator from memory whose 16-bit address is given
6 STA 16-bit Address Store Accumulator from memory whose 16-bit address is given
7 LHLD 16-bit Address Load HL pair direct from memory whose 16-bit address is given
8 SHLD 16-bit Address Store HL pair in memory whose 16-bit address is given
9 LDAX [Rp] Load Accumulator from memory whose 16-bit address is given in Register Pair
10 STAX [Rp] Store Accumulator from memory whose 16-bit address is given in Register Pair
11 XCHG Exchanges content of HL with DE register pair

 

Example-1: Writa an ALP to transfer a data byte from memory location 2050h and store it at location 2060 h.

Answer:

  1. Using Direct addressing mode

                                   LDA 2050h

                                   STA 2060h

                                   HLT

  1. Indirect addressing Mode

                                   LXI D, 2050h

                                   LDAX D

                                   LXI D, 2060h

                                   STAX D

                                   HLT

Example-2: WAP to load a data byte 58h in accumulator and transfer the byte in register C and also in memory at address 2050h

Answer:

                                   MVI A, 58h

                                   MOV C, A

                                   STA 2050h

                                    HLT

Example-3: WAP in assembly language to exchange the 16-bit data

Answer:

                                   LXI H, 1234h

                                   LXI D, 2345h

                                   XCHG

                                   HLT

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