Explain the classification of the instruction set of 8085 microprocessor with suitable examples?

1. DATA TRANSFER INSTRUCTIONS
2. ARITHMETIC INSTRUCTIONS
3. BIT MANIPULATION INSTRUCTIONS
4. STRING INSTRUCTIONS
5. PROGRAM EXECUTION TRANSFER INSTRUCTIONS
6. PROCESS CONTROL INSTRUCTIONS

1.DATA TRANSFER INSTRUCTIONS

The DATA TRANSFER INSTRUCTIONS are those, which transfers the DATA from any one source to any one destination.The datas may be of any type. They are again classified into four groups.They are:

GENERAL - PURPOSE BYTE OR Word TRANSFER INSTRUCTIONS

SIMPLE INPUT AND OUTPUT PORT TRANSFER INSTRUCTION

SPECIAL ADDRESS TRANSFER INSTRUCTION

FLAG TRANSFER INSTRUCTIONS

MOV

PUSH

POP

XCHG

XLAT

IN

OUT

LEA

LDS

LES

LAHF

SAHF

PUSHF

POPF

2.ARITHMETIC INSTRUCTIONS

These instructions are those which are useful to perform Arithmetic calculations, such as addition, subtraction, multiplication and division.They are again classified into four groups.They are:

ADDITION INSTRUCTIONS

SUBTRACTION INSTRUCTIONS

MULTIPLICATION INSTRUCTIONS

DIVISION INSTRUCTIONS

ADD

ADC

INC

AAA

DAA

SUB

SBB

DEC

NEG

CMP

AAS

DAS

MUL

IMUL

AAM

DIV

IDIV

AAD

CBW

CWD

3.BIT MANIPULATION INSTRUCTIONS

These instructions are used to perform Bit wise operations.

LOGICAL INSTRUCTIONS

SHIFT INSTRUCTIONS

ROTATE INSTRUCTIONS

NOT

AND

OR

XOR

TEST

SHL / SAL

SHR

SAR

ROL

ROR

RCL

RCR

4. STRING INSTRUCTIONS

The string instructions function easily on blocks of memory.They are user friendly instructions, which help for easy program writing and execution. They can speed up the manipulating code.They are useful in array handling, tables and records.

STRING INSTRUCTIONS

REP

REPE / REPZ

REPNE / REPNZ

MOVS / MOVSB / MOVSW

COMPS / COMPSB / COMPSW

SCAS / SCASB / SCASW

LODS / LODSB / LODSW

STOS / STOSB / STOSW

5.PROGRAM EXECUTION TRANSFER INSTRUCTIONS

These instructions transfer the program control from one address to other address. ( Not in a sequence). They are again classified into four groups.They are:

UNCONDITIONAL TRANSFER INSTRUCTIONS

CONDITIONAL TRANSFER INSTRUCTIONS

ITERATION CONTROL INSTRUCTIONS

INTERRUPT INSTRUCTIONS

CALL

RET

JMP

JA / JNBE

JAE / JNB

JB / JNAE

JBE / JNA

JC

JE / JZ

JG / JNLE

JGE / JNL

JL / JNGE

JLE / JNG

JNC

JNE / JNZ

JNO

JNP / JPO

JNS

JO

JP / JPE

JS

LOOP

LOOPE / LOOPZ

LOOPNE / LOOPNZ

JCXZ

INT

INTO

IRET

6.PROCESS CONTROL INSTRUCTIONS

These instructions are used to change the process of the Microprocessor. They change the process with the stored information. They are again classified into Two groups.They are:

FLAG SET / CLEAR INSTRUCTIONS

EXTERNAL HARDWARE SYNCHRONIZATION INSTRUCTIONS

STC

CLC

CMC

STD

CLD

STI

CLI

HLT

WAIT

ESC

LOCK

NOP