practical 2 data transfer

7/28/2019 Practical 2 Data Transfer

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2.1

AIM: - To study various DATA TRANSFER instructions

THEORY: -

Data transfer instructions performs the primary function of copying data, from a

register or I/O or memory, which is called the source, to another register or I/O or

memory, which is called the destination.

Data transfer (copy) instructions can be used to copy data

From register to register.

Load an 8 bit number in a register.

Between memory and register.

Between I/O and accumulator.

Load 16 bit number in a register pair.

DATA TRANSFER INSTRUCTION SET:-

The following notations are used in the description of the instructions.

R = 8-bit register (A, B, C, D, E, H, L)

M = memory register (location)

RS = register source (A, B, C, D, E, H, L)

RD = register destination (A, B, C, D, E, H, L)

RP = register pair (BC, DE, HL)

Sr. No. Instruction No. of

Bytes

Description

Opcode Operand

1 MOV RD,RS 1 Copy data from RS to RD.

2 MOV M,R 1 Copy the data byte from

register R into memory location

whose address is stored in HL

register pair.

3 MOV R,M 1 Copy the data byte from a

memory location whose

address is stored in HL register

pair into a register R.4 MVI R, 8-bit 2 Load 8-bit data into a register

R.

5 MVI M, 8-bit 2 Load 8-bit data into memory

location whose address is

stored in HL register pair.

6 LXI RP, 16-bit 3 Load 16 bit of data in register

pair Rp

7 LDA 16-bit 3 Copy the data byte into the

accumulator from the memory

location indicated by 16-bitaddress.

ATMIYA INSTITUTE OF TECHNOLOGY & SCIENCE, RAJKOT

Subject:

Microprocessor and

Interfacing

Title:

To study data transfer instructions

Experiment No.02DATE:

Rev. No.

1.00


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2.2

8 STA 16-bit 3 Copy the data byte of the

accumulator into the memory

location indicated by 16-bit

address.

9 LDAX Rp 1 Copy the data byte into the

accumulator from the memory

location indicated by a registerpair Rp. (Rp = BC or DE)

10 STAX Rp 1 Copy the data byte from the

accumulator into the memory

location indicated by a register

pair Rp. (Rp = BC or DE)

11 LHLD 16-bit 3 Copy the contents of memory

location indicated by 16-bit

address in register L & copy the

contents of next memory

location in register H.

12 SHLD 16-bit 3 Store the contents of register Lin memory location indicated

by 16-bit address & the

contents of H register are stored

in next consecutive memory

location.

13 PCHL 1 Store the contents of registers

pair HL into the program

counter.

14 SPHL 1 Loads the contents of register

pair HL into the stack pointer.

15 XCHG 1 The contents of register H are

exchanged with the contents of

register D, & the contents of

register L are exchanged with

the contents of register E.

16 XTHL 1 The contents of L register are

exchanged with the stack

location pointed out by stack

pointer. the contents of the H

register are exchanged with the

next stack location (SP+1).17 IN 8 bits 2 Accept data byte from an i/p

device & place it in the

accumulator.

18 OUT 8 bits 2 Send data byte from the

accumulator to an o/p device.

No flags are affected due to data transfer instructions.



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2.3

EXERCISE

1) Write single equivalent instruction for the following programs.

a) MVI D, F0H b) MOV A, L

MVI E, 00H STA F000H

XCHG MOV A, H

MOV M, A STA F001H

2) Write an assembly language program to interchange the data content stored at memory

location F000H and F001H.

3) Write an assembly language program to interchange the 16-bit data stored in register BC

and register DE (with and without XCHG instruction).

4) Two 16-bit data are stored in consecutive memory location starting from F000H with

lower bytes stored first. Write an assembly language program to copy this data in four

consecutive memory locations starting from D000H.

5) Write an assembly language program to load register pair BC and DE with 16-bit of data

F0F1H and E0E1H respectively and copy this data in consecutive memory location

starting with lower bytes first.

6) Write and A.L.P. to delete the data byte (i.e. make 00H) stored at memory location

whose address is stored at DE register pair.

Grade Lab-In-Charge H.O.D.


practical 2 data transfer

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