8085-Data Transfer instructions


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
12
IN #port number
Reads a byte of data from input port into the accumulator
13
OUT #port number
Outputs the content of Accumulator at the output port
14
PCHL
Exchanges contents of PC and HL register pair
15
XTHL
exchange stack with HL 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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