Notes 8086 instruction format
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A microprocessor is an electronic component that is used by a computer to do its work. It is a central processing unit on a single integrated circuit chip containing millions of very small components including transistors, resistors, and diodes that work together. Some microprocessors in the 20th century required several chips. Microprocessors help to do everything from controlling elevators to searching the Web. Everything a computer does is described by instructions of computer programs, and microprocessors carry out these instructions many millions of times a second. [1] Microprocessors were invented in the 1970s for use in embedded systems. The majority are still used that way, in such things as mobile phones, cars, military weapons, and home appliances. Some microprocessors are microcontrollers, so small and inexpensive that they are used to control very simple products like flashlights and greeting cards that play music when you open them. A few especially powerful microprocessors are used in personal computers.
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![Addressing modes of 8086:
1. Immediate addressing mode:
An instruction in which 8-bit or 16-bit operand(data ) is specified in the
instruction, then the addressing mode of such instruction is known as
Immediate addressing mode.
Example:
MOV AX,67D3H
AX 67D3H
ADD AL,5CH
AL 5CH
- Immediate data can be 8-bit or 16-bit
Immediate data cannot be the destination
2. Register addressing mode
An instruction in which an operand(data) is specified in general purpose
registers, then the addressing mode is known as register addressing mode.
Example:
MOV AX,CX
AX CX
MOV BL,DL
BL DL
Both source and destination should be of the same size
Data is copied to destination, source value is retained
3. Direct addressing mode
-an instruction in which 16 bit effective address of an operand is specified
in the instruction, then the addressing mode of such instruction is known as
direct addressing mode.
Example:
MOV CL,[2000H]](https://image.slidesharecdn.com/notes8086instructionformat-200319141128/85/Notes-8086-instruction-format-2-320.jpg)
![CL byte from memory location [10H x DS + 2000H]
MOV AX,[5000H]
AX 2 bytes from memory location [10H x DS + 5000H]
4. Register Indirect addressing mode
an instruction in which address of an operand is specified in pointer
register or in index register or in BX, then the addressing mode is known as
register indirect addressing mode.
Example:
MOV AX, [BX]
AX [10H x DS + BX]
MOV CL,[SI]
CL [10H x DS + SI]
5. Indexed addressing mode
an instruction in which the offset address of an operand is stored in index
registers (SI or DI) then the addressing mode of such instruction is known as
indexed addressing mode.
DS is the default segment for SI and DI.
For string instructions DS and ES are the default segments for SI and DI
resp.
this is a special case of register indirect addressing mode.
Example:
MOV AX,[SI]
AX [10H x DS + SI]
6. Based Indexed addressing mode
an instruction in which the address of an operand is obtained by adding the
contents of base register (BX or BP) to the content of an index register (SI or DI)
The default segment register may be DS or ES
Example:
MOV AX, [BX][SI]
AX [10H x DS + SI + BX]
7. Register relative addressing mode
an instruction in which the address of the operand is obtained by adding
the displacement (8-bit or 16 bit) with the contents of base registers or index
registers (BX, BP, SI, DI).
the default segment register is DS or ES
Example:
MOV AX, 50H[BX]
Ax [10H x DS + 50H + BX]
8. Relative Based Indexed addressing mode
an instruction in which the address of the operand is obtained by adding
the displacement (8 bit or 16 bit) with the base registers(BX or BP) and index
registers (SI or DI) to the default segment.
Example:
MOV AX, 50H [BX][SI]
AX [10H x DS + 50H + BX + SI]](https://image.slidesharecdn.com/notes8086instructionformat-200319141128/85/Notes-8086-instruction-format-3-320.jpg)
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Efficient software development for the microprocessor requires a complete familiarity with the instruction set, their format and addressing modes. Here in this chapter, we will focus on the addressing modes and instructions formats of microprocessor 8086.Program is a set of instructions written to solve a problem. Instructions are the directions which a microprocessor follows to execute a task or part of a task. Broadly, computer language can be divided into two parts as high-level language and low level language. Low level language are machine specific. Low level language can be further divided into machine language and assembly language.
Machine language is the only language which a machine can understand. Instructions in this language are written in binary bits as a specific bit pattern. The computer interprets this bit pattern as an instruction to perform a particular task. The entire program is a sequence of binary numbers. This is a machine-friendly language but not user friendly. Debugging is another problem associated with machine language.
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Efficient software development for the microprocessor requires a complete familiarity with the instruction set, their format and addressing modes. Here in this chapter, we will focus on the addressing modes and instructions formats of microprocessor 8086.
Program is a set of instructions written to solve a problem. Instructions.
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Module 2 instruction set 
Module 2 instruction set Deepak John Machine Language Instruction Formats – Instruction Set of 8086-Data transfer
instructions,Arithmetic and Logic instructions,Branch instructions,Loop instructions,Processor
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Adressing modes of 8086KANNANKR12 This document discusses the different addressing modes of the 8086 processor. It explains that addressing modes refer to the different ways a processor can access data. It then describes the eight addressing modes of the 8086 - immediate, direct, register, register indirect, indexed, register relative, based indexed, and relative based indexed. Each mode is defined and an example is given to illustrate how the effective address is calculated in each case.
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Development of MLR, ANN and ANFIS Models for Estimation of PCUs at Different ...Journal of Soft Computing in Civil Engineering
Notes 8086 instruction format
- 1. Chapter 3 Machine Language instruction format: A machine language instruction format has one or more number of fields associated with it. The first field is called the opcode field, which indicate the type of operation performed by the CPU. The second field is called as an operand field which specifies the data on which the operation is to be performed. The general format of 8086 instruction with different fields is as given below. 8086 Instructions arerepresented as binary numbers Instructions require between 1 and 6 bytes. Opcode byte Addressing mode byte low disp, addr, or data high disp, addr, or data low data high data This is the general instruction format used by the majority of 2-operand instructions. Bytes 1 and 2 are divided up into 6 fields: opcode d -direction (or s = sign extension) w -word/byte mod -mode reg -register r/m -register/memory opcode field specifies the operation performed (mov, xchg,etc) d (direction) field specifies the direction of data movement: d = 1 data moves from operand specified by R/M field to operand specified by REG field d = 0 data moves from operand specified by REG field to operand specified by R/M field W (word/byte) specifies operand size W = 1 data is word W = 0 data is byte The tables below show the operands chosen for each fields.
- 2. Addressing modes of 8086: 1. Immediate addressing mode: An instruction in which 8-bit or 16-bit operand(data ) is specified in the instruction, then the addressing mode of such instruction is known as Immediate addressing mode. Example: MOV AX,67D3H AX 67D3H ADD AL,5CH AL 5CH - Immediate data can be 8-bit or 16-bit Immediate data cannot be the destination 2. Register addressing mode An instruction in which an operand(data) is specified in general purpose registers, then the addressing mode is known as register addressing mode. Example: MOV AX,CX AX CX MOV BL,DL BL DL Both source and destination should be of the same size Data is copied to destination, source value is retained 3. Direct addressing mode -an instruction in which 16 bit effective address of an operand is specified in the instruction, then the addressing mode of such instruction is known as direct addressing mode. Example: MOV CL,[2000H]
- 3. CL byte from memory location [10H x DS + 2000H] MOV AX,[5000H] AX 2 bytes from memory location [10H x DS + 5000H] 4. Register Indirect addressing mode an instruction in which address of an operand is specified in pointer register or in index register or in BX, then the addressing mode is known as register indirect addressing mode. Example: MOV AX, [BX] AX [10H x DS + BX] MOV CL,[SI] CL [10H x DS + SI] 5. Indexed addressing mode an instruction in which the offset address of an operand is stored in index registers (SI or DI) then the addressing mode of such instruction is known as indexed addressing mode. DS is the default segment for SI and DI. For string instructions DS and ES are the default segments for SI and DI resp. this is a special case of register indirect addressing mode. Example: MOV AX,[SI] AX [10H x DS + SI] 6. Based Indexed addressing mode an instruction in which the address of an operand is obtained by adding the contents of base register (BX or BP) to the content of an index register (SI or DI) The default segment register may be DS or ES Example: MOV AX, [BX][SI] AX [10H x DS + SI + BX] 7. Register relative addressing mode an instruction in which the address of the operand is obtained by adding the displacement (8-bit or 16 bit) with the contents of base registers or index registers (BX, BP, SI, DI). the default segment register is DS or ES Example: MOV AX, 50H[BX] Ax [10H x DS + 50H + BX] 8. Relative Based Indexed addressing mode an instruction in which the address of the operand is obtained by adding the displacement (8 bit or 16 bit) with the base registers(BX or BP) and index registers (SI or DI) to the default segment. Example: MOV AX, 50H [BX][SI] AX [10H x DS + 50H + BX + SI]