[PDF] INSTRUCTION SET OF 8085 memory location specified by the





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Assembly Language Programming of 8085

For e.g. assembly language of 8085 is different than that of Motorola 6800 microprocessor. Page 8. Microprocessor understands Machine Language only! • 



8080/8085 ASSEMBLY LANGUAGE PROGRAMMING M.ANUAL

This manual describes programming with Intel's assembly language. ISIS-II 8080/8085 MACRO ASSEMBLER OPERATOR'S MANUAL 9800292.



INSTRUCTION SET OF 8085

memory location specified by the contents of the register pair. Example: STAX B. Page 13. Data Transfer Instructions. Opcode.



Assembly Language Programming of 8085

For e.g. assembly language of 8085 is different than that of Motorola 6800 microprocessor. Page 6. Microprocessor understands Machine Language only! • 



ASSEMBLY LANGUAGE TUTORIAL - Simply Easy Learning by

Assembly language is converted into executable machine code by a utility program referred to as an assembler like NASM MASM etc. Audience. This tutorial has 



Lecture Note On Microprocessor and Microcontroller Theory and

mnemonics which forms the assembly language. The 8085 microprocessor is an 8-bit processor available as a 40-pin IC package and uses +5. V for power.



Assembly language programming: 8085 program to add two 8 bit

Problem – Write an assembly language program to add two 8 bit numbers stored at address 2050 and address 2051 in 8085 microprocessor. The starting.



MICROPROCESSOR LAB MANUAL EEC-553

8085 Microprocessor programming kit instruction coding sheet. SCIENTECH-8085. 1. 2. Power supply. A.C (230V Mains). DESCRIPTION/ALGORITHM:-.



Appendix A: 8085 Instruction Set by Opcode

Microelectronics and Microprocessor-based Sy stems. Data Transfer Group. These instructions transfer data between registers and memory.



8080/8085 ISSEMBL Y LANGUAGE PROGRiMMING MANUAL

Description of the assembler. Overview of 8080 hardware and instruction set. Description of 8D80/8085 differences. ASSEMBLY LANGUAGE CONCEPTS.

INSTRUCTION SET OF 8085

Instruction Set of 8085

yAn instruction is a binary pattern designed inside a microprocessor to perform a specific function. yThe entire group of instructions that a microprocessor supports is called Instruction Set. y8085 has 246instructions. yEach instruction is represented by an 8-bit binary value. yThese 8-bits of binary value is called Op-Codeor Instruction Byte.

Classification of Instruction Set

Data Transfer Instruction

Arithmetic Instructions

Logical Instructions

Branching Instructions

Control Instructions

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.

Data Transfer Instructions

OpcodeOperandDescription

MOVRd, Rs

Rd, M

M, RsCopy from source to destination.

yThis instruction copies the contents of the source register into the destination register. yThe contents of the source register are not altered.

yIf one of the operands is a memory location, its location is specified by the contents of the HL registers.

yExample:MOV B, C yMOV B, M yMOV M, C

Data Transfer Instructions

OpcodeOperandDescription

MVIRd,Data

M, DataMove immediate 8-bit

yThe 8-bit data is stored in the destination register or memory. yIf the operand is a memory location, its location is specified by the contents of the H-L registers. yExample:MVI A, 57H yMVI M, 57H

Data Transfer Instructions

OpcodeOperandDescription

LXIReg.pair, 16-bit

dataLoad register pair immediate yThis instruction loads 16-bit data in the register pair. yExample:LXI H, 2034 H

Data Transfer Instructions

OpcodeOperandDescription

LDA16-bit addressLoadAccumulator

yThe contents of a memory location, specified by a 16- bit address in the operand, are copied to the accumulator. yThe contents of the source are not altered. yExample:LDA 2034H

Data Transfer Instructions

OpcodeOperandDescription

LDAXB/D Register PairLoad accumulator indirect

yThe contents of the designated register pair point to a memory location. yThis instruction copies the contents of that memory location into the accumulator. yThe contents of either the register pair or the memory location are not altered. yExample:LDAX B

Data Transfer Instructions

OpcodeOperandDescription

LHLD16-bit addressLoad H-L registers direct

yThis instruction copies the contents of memory location pointed out by 16-bit address into register L. yIt copies the contents of next memory location into register H. yExample:LHLD 2040 H

Data Transfer Instructions

OpcodeOperandDescription

STA16-bit addressStore accumulator direct

yThe contents of accumulator are copied into the memory location specified by the operand. yExample:STA 2500 H

Data Transfer Instructions

OpcodeOperandDescription

STAXReg. pairStore accumulator indirect

yThe contents of accumulator are copied into the memory location specified by the contents of the register pair. yExample:STAX B

Data Transfer Instructions

OpcodeOperandDescription

SHLD16-bit addressStore H-L registers direct

yThe contents of register L are stored into memory location specified by the 16-bit address. yThe contents of register H are stored into the next memory location. yExample:SHLD 2550 H

Data Transfer Instructions

OpcodeOperandDescription

XCHGNoneExchange H-L with D-E

yThe contents of register H are exchanged with the contents of register D. yThe contents of register L are exchanged with the contents of register E. yExample:XCHG

Arithmetic Instructions

These instructions perform the operations like:

Addition

Subtract

Increment

Decrement

Addition

Any 8-bit number, or the contents of register, or the contents of memory location can be added to the contents of accumulator.

The result (sum) is stored in the accumulator.

No two other 8-bit registers can be added directly. Example:The contents of register B cannot be added directly to the contents of register C.

Subtraction

Any 8-bit number, or the contents of register, or the contents of memory location can be subtracted from the contents of accumulator.

The result is stored in the accumulator.

Subtraction is performed in 2's complement form.

If the result is negatiǀe, it is stored in 2's complement form. No two other 8-bit registers can be subtracted directly.

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.

Arithmetic Instructions

OpcodeOperandDescription

ADDR

MAdd register or memory to accumulator

yThe contents of register or memory are added to the contents of accumulator. yThe result is stored in accumulator. yIf the operand is memory location, its address is specified by H-L pair. yAll flags are modified to reflect the result of the addition. yExample:ADD B or ADD M

Arithmetic Instructions

OpcodeOperandDescription

ADCR

MAdd register or memory to accumulator with

carry yThe contents of register or memory and Carry Flag (CY) are added to the contents of accumulator. yThe result is stored in accumulator. yIf the operand is memory location, its address is specified by H-L pair. yAll flags are modified to reflect the result of the addition. yExample:ADC B or ADC M

Arithmetic Instructions

OpcodeOperandDescription

ADI8-bit dataAdd immediate to accumulator

yThe 8-bit data is added to the contents of accumulator. yThe result is stored in accumulator. yAll flags are modified to reflect the result of the addition. yExample:ADI 45 H

Arithmetic Instructions

OpcodeOperandDescription

ACI8-bit dataAdd immediate to accumulator with carry yThe 8-bit data and the Carry Flag (CY) are added to the contents of accumulator. yThe result is stored in accumulator. yAll flags are modified to reflect the result of the addition. yExample:ACI 45 H

Arithmetic Instructions

OpcodeOperandDescription

DADReg. pairAdd register pair to H-L pair

yThe 16-bit contents of the register pair are added to the contents of H-L pair. yThe result is stored in H-L pair. yIf the result is larger than 16 bits, then CY is set. yNo other flags are changed. yExample:DAD B

Arithmetic Instructions

OpcodeOperandDescription

SUBR

MSubtract register or memory from accumulator

yThe contents of the register or memory location are subtracted from the contents of the accumulator.

yThe result is stored in accumulator. yIf the operand is memory location, its address is specified by H-L pair. yAll flags are modified to reflect the result of subtraction. yExample:SUB B or SUB M

Arithmetic Instructions

OpcodeOperandDescription

SBBR

MSubtract register or memory from accumulator

with borrow

yThe contents of the register or memory locationand Borrow Flag (i.e. CY)are subtracted from the contents of the accumulator.

yThe result is stored in accumulator. yIf the operand is memory location, its address is specified by H-L pair. yAll flags are modified to reflect the result of subtraction. yExample:SBB B or SBB M

Arithmetic Instructions

OpcodeOperandDescription

SUI8-bit dataSubtract immediate from accumulator

yThe 8-bit data is subtracted from the contents of the accumulator. yThe result is stored in accumulator. yAll flags are modified to reflect the result of subtraction. yExample:SUI 45 H

Arithmetic Instructions

OpcodeOperandDescription

SBI8-bit dataSubtract immediate from accumulator with borrow yThe 8-bit data and the Borrow Flag (i.e. CY) is subtracted from the contents of the accumulator. yThe result is stored in accumulator. yAll flags are modified to reflect the result of subtraction. yExample:SBI 45 H

Arithmetic Instructions

OpcodeOperandDescription

INRR

MIncrement register or memory by 1

yThe contents of register or memory location are incremented by 1. yThe result is stored in the same place. yIf the operand is a memory location, its address is specified by the contents of H-L pair. yExample:INR B or INR M

Arithmetic Instructions

OpcodeOperandDescription

INXRIncrement register pair by 1

yThe contents of register pair are incremented by 1. yThe result is stored in the same place. yExample:INX H

Arithmetic Instructions

OpcodeOperandDescription

DCRR

MDecrement register or memory by 1

yThe contents of register or memory location are decremented by 1. yThe result is stored in the same place. yIf the operand is a memory location, its address is specified by the contents of H-L pair. yExample:DCR B or DCR M

Arithmetic Instructions

OpcodeOperandDescription

DCXRDecrement register pair by 1

yThe contents of register pair are decremented by 1. yThe result is stored in the same place. yExample:DCX H

Logical Instructions

These instructions perform logical operations on data stored in registers, memory and status flags.

The logical operations are:

AND OR XOR

Rotate

Compare

Complement

AND, OR, XOR

Any 8-bit data, or the contents of register, or memory location can logically have

AND operation

OR operation

XOR operation

with the contents of accumulator.

The result is stored in accumulator.

Rotate

Each bit in the accumulator can be shifted either left or right to the next position.

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.

Complement

The contents of accumulator can be complemented.

Each 0 is replaced by 1 and each 1 is replaced by 0.

Logical Instructions

OpcodeOperandDescription

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