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Explain the classification of the instruction set of 8085 microprocessor with suitable examples?
Wiki User
∙ 13y ago
- DATA TRANSFER INSTRUCTIONS
- ARITHMETIC INSTRUCTIONS
- BIT MANIPULATION INSTRUCTIONS
- STRING INSTRUCTIONS
- PROGRAM EXECUTION TRANSFER INSTRUCTIONS
- 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
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∙ 13y ago
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Suppose we give a 8-bit instruction ADD B to the microprocessor then this instruction is not at all understood by microprocessor as it only accepts binary inputs so first of all it stores the instruction in the INSTRUCTION REGISTOR then it decodes this instruction ADD B to its suitable binary code 80H in the INSTRUCTION DECODER.. after converting to 80H then the microprocessor understands that .. yes i have to add the content of the resistor B with that of A(accumulator) and store the result in the accumulator A this is a small example how microprocessor operates facing the instructions
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