Microprocessors & Microcontrollers

8085: Instructions

Department of Electronics and Communication Engineering

INSTRUCTION SET OF 8085 MICROPROCESSOR
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INSTRUCTION SET OF 8085 MICROPROCESSOR
INSTRUCTION SET OF 8085 MICROPROCESSOR

INSTRUCTION SET OF 8085

MICROPROCESSOR
8085 Instruction Set 46
8085 Instruction Set 47
Data Transfer Instructions

8085 Instruction Set 48

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8085 Instruction Set
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• PSW (Program Status word)
• - Flag unaffected
• * affected
• 0 reset
• 1 set
• S Sign (Bit 7)
• Z Zero (Bit 6)
• AC Auxiliary Carry (Bit 4)
• P Parity (Bit 2)
• CY Carry (Bit 0)

8085 Instruction Set 89

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„ circular Left shift

8085 Instruction Set 108

8085 Instruction Set 109
„ circular right shift

8085 Instruction Set 110

„ circular right shift

8085 Instruction Set 111

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Summary
8085 Instruction Set 132
Summary – Data transfer
• MOV Move
• MVI Move Immediate
• LDA Load Accumulator Directly from Memory
• STA Store Accumulator Directly in Memory
• LHLD Load H & L Registers Directly from Memory
• SHLD Store H & L Registers Directly in Memory

8085 Instruction Set 133

Summary Data transfer
• An 'X' in the name of a data transfer instruction implies that it deals
with a register pair (16-bits);

• LXI Load Register Pair with Immediate data

• LDAX Load Accumulator from Address in Register Pair
• STAX Store Accumulator in Address in Register Pair
• XCHG Exchange H & L with D & E
• XTHL Exchange Top of Stack with H & L

8085 Instruction Set 134

Summary - Arithmetic Group
• Add, Subtract, Increment / Decrement data in registers or memory.

• ADD Add to Accumulator

• ADI Add Immediate Data to Accumulator
• ADC Add to Accumulator Using Carry Flag
• ACI Add Immediate data to Accumulator Using Carry
• SUB Subtract from Accumulator
• SUI Subtract Immediate Data from Accumulator
• SBB Subtract from Accumulator Using Borrow (Carry) Flag
• SBI Subtract Immediate from Accumulator
Using Borrow (Carry) Flag
• INR Increment Specified Byte by One
• DCR Decrement Specified Byte by One
• INX Increment Register Pair by One
• DCX Decrement Register Pair by One
• DAD Double Register Add; Add Content of Register Pair to H & L
Register Pair

8085 Instruction Set 135

Summary Logical Group
• This group performs logical (Boolean) operations on data in
registers and memory and on condition Ʋags.
• These instructions enable you to set speciƱc bits in the
accumulator ON or OFF.

• ANA Logical AND with Accumulator

• ANI Logical AND with Accumulator Using Immediate
Data
• ORA Logical OR with Accumulator
• OR Logical OR with Accumulator Using Immediate
Data
• XRA Exclusive Logical OR with Accumulator
• XRI Exclusive OR Using Immediate Data
8085 Instruction Set 136
• The Compare instructions compare the content of an 8-bit value with the contents of the accumulator;

• CMP Compare
• CPI Compare Using Immediate Data

• The rotate instructions shift the contents of the accumulator one bit position to the left or right:

• RLC Rotate Accumulator Left

• RRC Rotate Accumulator Right
• RAL Rotate Left Through Carry
• RAR Rotate Right Through Carry

• Complement and carry flag instructions:

• CMA Complement Accumulator

• CMC Complement Carry Flag
• STC Set Carry Flag

8085 Instruction Set 137

Summary - Branch Group
• Unconditional branching
• JMP Jump
• CALL Call
• RET Return
• Conditions
• NZ Not Zero (Z = 0)
• Z Zero (Z = 1)
• NC No Carry (C = 0)
• C Carry (C = 1)
• PO Parity Odd (P = 0)
• PE Parity Even (P = 1)
• P Plus (S = 0)
• M Minus (S = 1)
• Conditional branching

8085 Instruction Set 138

Summary - Stack
• PUSH Push Two bytes of Data onto the Stack
• POP Pop Two Bytes of Data off the Stack
• XTHL Exchange Top of Stack with H & L
• SPHL Move content of H & L to Stack Pointer

8085 Instruction Set 139

I/0 instructions
• IN Initiate Input Operation
• OUT Initiate Output Operation

8085 Instruction Set 140

 Summary -Machine Control instructions

• EI Enable Interrupt System

• DI Disable Interrupt System
• HLT Halt
• NOP No Operation

8085 Instruction Set 141

INSTRUCTION FORMAT FOR ALP

8085 Instruction Set 142

INSTRUCTION FORMAT
 Contd…

• I
 Contd…

• Intel
 Contd…

• S
 Contd…

• I
 PROGRAM

• Intel 8086 microprocessor

PROGRAM
OPCODE OF THE 8085 INSTRUCTION SET
OPCODE OF THE 8085 INSTRUCTION SET
OPCODE OF THE 8085 INSTRUCTION SET
OPCODE OF THE 8085 INSTRUCTION SET
Contd… MCQ
Contd… MCQ
Contd… MCQ
Contd… MCQ
Contd… SHORT ANSWER TYPE QUESTION ON MICROPROCESSORS
Contd… REVIEW QUESTION ON MICROPROCESSORS
Contd… REVIEW QUESTION ON MICROPROCESSORS
ADDRESSING MODE OF 8085 MICROPROCESSOR
 Immediate Addressing Mode
• In this mode, the operand
p is speciƱed within
the instruction itself.

MVI A, 05 H Move 05 H in accumulator.

• MVI is the operation.
• 05 H is the immediate data (source).
• A is the destination.
 Register Addressing Mode
• In this mode, the operand is in general
purpose register.

MOV A, B Move the contents of register B to A.

• MOV is the operation.

• B is the source of data.
• A is the destination.
 Direct Addressing Mode
• In this mode, the address of the operand is
given in the instruction itself.
itself

LDA 2500 H Load the contents of memory

location 2500 H in accumulator.
• LDA is the operation.
• 2500 H is the address of source.
• Accumulator is the destination.
 Register Indirect Addressing Mode

• In this mode, the address of operand is

specified by a register pair.

MOV A, M Move data from memory location

specified by H-L pair to accumulator.
• MOV is the operation.
• M is the memory location specified by H-L
register pair.
• A is the destination.
 Implicit Addressing Mode
y If address of source of data as well as
address of destination of result is Ʊxed, then
there is no need to give any operand along
with the instruction.

CMA Complement accumulator.

y CMA is the operation.

y A is the source.
y A is the destination.
Program the given problem in assembly language and make a flow chart for the same.
Flow Chart with Programming
Flow Chart with Programming