The presentation contains 8085 instruction sets and types of instructions and which instructions are there.

1. Subject : Microprocessor & Microcontroller
Interfacing
Semester: 5th
Topic : 8085 Instruction
PRESENTED BY: CHINTAN HANSALIA
(151310109009)

2. Content
Introduction
Classification of Instruction Set
Data Transfer Instruction
Arithmetic Instructions
Logical Instructions
Branching Instructions
Stack & machine control Instructions
Chintan Hansalia 151310109009

3. Introduction
 An instruction is a binary pattern designed inside a
microprocessor to perform a specific function.
 The entire group of instructions that a microprocessor
supports is called Instruction Set.
 Each instruction basically consists of two parts. 1st part is called
opcode & 2nd part is called operand.
 Opcode : operation to be performed
 Operand : provides the data or specifies data
Chintan Hansalia 151310109009

4. Classification of Instruction Set
● Data Transfer Instruction
● Arithmetic Instructions
● Logical Instructions
● Branching Instructions
● Stack & machine control Instructions
Chintan Hansalia 151310109009

5. Data Transfer Instructions
 These instructions move data between registers, or between memory
and registers.
 These instructions copy data from source to destination.
● While copying, the contents of source are not modified
Chintan Hansalia 151310109009

6. Opcode Opcode Description
MOV R , M Copy from source to destination.
MVI R , M Data Move immediate 8-bit
LDA 16-bit add. Load Accumulator
STA 16-bit add. Store accumulator direct
LHLD 16-bit add. Load H-L registers direct
SHLD 16-bit add. Store H-L registers direct
LXI Reg. pair, 16-
bit data
Load register pair immediate
LDAX BD Reg. pair Load accumulator indirect
XCHG None Exchange H-L with D-E
STAX Reg. pair Store accumulator indirect
XTHL None Exchange H–L with top of stack
Instructions
Chintan Hansalia 151310109009

7. Arithmetic Instructions
Addition/Subtraction
● Any 8-bit no. or the contents of register or the contents of
memory location can be added(subtracted) to the contents of
accumulator.
● The result is stored in the accumulator.
● No two other 8-bit registers can be added(subtracted) directly.
● For subtraction, it is performed in 2’s complement form.
Chintan Hansalia 151310109009

8. Increment / Decrement
 The 8-bit contents of a register or a memory location can be
incremented or decremented by 1.
 The 16-bit contents of a register pair can be incremented or
decremented by 1.
 Increment or decrement can be performed on any register or a
memory location.
Chintan Hansalia 151310109009

9. Opcode Opcode Description
ADD R , M Add register or memory to accumulator
ADI 8 -bit data Add immediate, data to accumulator
ADC R , M Add register or memory to accumulator with carry
ACI 8 – bit data Add immediate, data to accumulator with carry
SUB R , M Subtract register or memory from accumulator
SUI 8 – bit data Subtract immediate, data from accumulator
SBB R , M Subtract register or memory from accumulator with borrow
SBI 8 – bit data Subtract immediate, data from accumulator with borrow
INR R , M Increment register or memory by 1
DCR R, M Decrement register or memory by 1
INX R Increment register pair by 1
DCX R Decrement register pair by 1
DAD Reg. pair Add register pair to H-L pair
Instruction
Chintan Hansalia 151310109009

10. Logical Instructions
AND, OR, XOR
●Any 8-bit data, or the contents of register, or memory location can
logically have
●AND , OR ,XOR operation with the contents of accumulator.
●The result is stored in accumulator.
Chintan Hansalia 151310109009

11. Rotate, Complement, Compare
●Rotate: Each bit in the accumulator can be shifted either left or right
to the next position.
●Complement: The contents of accumulator can be complemented.
Each 0 is replaced by 1 and each 1 is replaced by 0.
● Compare: Any 8-bit data or the contents of register, or memory
location can be compares for: Equality, Greater Than, Less Than, with
the contents of accumulator.
● The result is reflected in status flags.
Chintan Hansalia 151310109009

12. Opcode Opcode Description
ANA R , M Logical AND register or memory with accumulator
ANI 8-bit data Logical AND immediate, data with accumulator
ORA R , M Logical OR register or memory with accumulator
ORI 8-bit data Logical OR immediate, data with accumulator
XRA R , M Logical XOR register or memory with accumulator
XRI 8-bit data XOR immediate, data with accumulator
CMP R , M Compare register or memory with accumulator
CPI 8-bit data Compare immediate, data with accumulator
RLC None Rotate accumulator left
RRC None Rotate accumulator right
RAL None Rotate accumulator left through carry
RAR None Rotate accumulator right through carry
CMA None Complement accumulator
CMC None Complement carry
STC None Set carry
Instruction
Chintan Hansalia 151310109009

13. Opcode
(JUMP)
Opcode
(CALL)
Opcode
(RET)
Description Status Flags
JC CC RC if Carry CY = 1
JNC CNC RNC if No Carry CY = 0
JP CP RP if Positive S = 0
JM CM RM if Minus S = 1
JZ CZ RZ if Zero Z = 1
JNZ CNZ RNZ if No Zero Z = 0
JPE CPE RPE if Parity Even P = 1
JPO CPO RPO if Parity Odd P = 0
Chintan Hansalia 151310109009
Opcode Operand Description
JUMP None Jump unconditionally
CALL None Call unconditionally
RET None Return unconditionally
Branching Instructions
●The branching instruction
alter the normal sequential
flow.
●These instructions alter
either unconditionally or
conditionally.

14. Stack & Machine Control Instructions
● Used to read/write stack memory, control the
enabling/disabling interrupt
● Control the stack operations, input/output
operation and machine control operations.
●The stack instructions allow the transfer of data
from register pair to stack memory and vice-
versa.
Chintan Hansalia 151310109009
Opcode Description
NOP No operation
HLT Halt
DI Disable Interrupt
EI Enable Interrupt
RIM Read Interrupt Mask
SIM Set Interrupt Mask

15. Reference
● Tech-Max by U. S. Shah
● Wikipedia
● ebooks.bharathuvi.ac.in
● Lecture notes
Thank You