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:
LDA 2050h
STA 2060h
HLT
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