8086 ARCHITECTURE PDF an 8086 family microprocessor is

8086 Microprocessor

১৮ জানু ২০২৩ Multiplication and Division instructions also use the AX or. AL. Execution Unit (EU). Page 29. Architecture. 8086 Microprocessor.

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8086 Microprocessor Architecture and Operation: It is a 16 bit µp. 8086 has a 20 bit address bus can access upto 220 memory locations ( 1. MB) . It can

8086- Architecture: Features

or write operands from memory the BIU is free to look ahead in the program by pre-fetching the next sequential instruction. Page 18. 18. • These pre-fetching

The 8086 Microprocessor

The architecture of 8086 is shown below in Fig. 11.3. It has got two separate functional units—Bus Interface Unit (BIU) and Execution Unit (EU). 8086

The Intel Microprocessors 8086/8088 80186/80188

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Features of 8086 Microprocessor:

The bus interface unit is the 8086 Internal Architecture to the outside world. It provides a full 16-bit bi- directional data bus and 20-bit address bus. The

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Four general-purpose 16-bit registers: AX BX

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✓ Internal architecture of 8259A. ✓ Interrupt Operation of 8259A. ✓ Programming Modes ICWs

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Architecture and Marine Engineering. (NAME) began its journey from academic ... microprocessor using assembly language in a group project. M H. H. (H – High ...

Intel 8086 MICROPROCESSOR ARCHITECTURE

or write operands from memory the BIU is free to look ahead in the program by pre-fetching the next sequential instruction. Page 18. 18. Segmented Memory.

Lecture Note On Microprocessor and Microcontroller Theory and

8086 Microprocessor Architecture and Operation: It is a 16 bit µp. 8086 has a 20 bit address bus can access upto 220 memory locations ( 1. MB) . It

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8086 Architecture. Introduction to Microprocessors. A microprocessor is a computer processor which incorporates the functions of a computer's central

8086 ARCHITECTURE

an 8086 family microprocessor is at the lower address. The 8086 has two parts the Bus Interface Unit (BIU) and the Execution Unit.

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Chapter 1 covers 8086/8088 architecture in adequate detail. Chapter 9 covers 80286 along with its coprocessor. Chapter 10 covers the microprocessor 80386 and

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In this tutorial we will discuss the architecture

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8086 has a 20 bit address bus can access up Intel 8086 Internal Architecture ... or write operands from memory the BIU is free to.

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The 8086 microprocessor has a much more powerful instruction set along with the architectural developments which imparts substantial programming flexibility

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The next major step in the evolution of the microprocessor was the introduction in 1972 of The 8086 is the first appearance of the x86 architecture.

8086 ARCHITECTURE MICROPROCESSORS &INTERFACING

8086 ARCHITECTURE

8086 Features

¾ 16-bit Arithmetic Logic Unit

¾ 16-bit data bus

¾ 20-bit address bus 1,048,576 = 1 meg

¾ 16 I/O lines so it can access 64K I/O ports

¾ 16 bit flag

¾ It has 14 -16 bit registers

¾ Clock frequency range is 5-10 MHZ

¾ Designed by Intel

¾ Rich set of instructions

¾ 40 Pin DIP, Operates in two modes

8086 ARCHITECTURE MICROPROCESSORS &INTERFACING

The address refers to a byte in memory. In the 8086, bytes at even addresses come in on the low half of the data bus (bits 0-7) and bytes at odd addresses come in on the upper half of the data bus (bits 8-15).The 8086 can read a 16-bit word at an even address in one operation and at an odd address in two operations. The least significant byte of a word on an 8086 family microprocessor is at the lower address. The 8086 has two parts, the Bus Interface Unit (BIU) and the Execution Unit (EU).The BIU fetches instructions, reads and writes data, and computes the 20-bit address. The EU decodes and executes the instructions using the 16-bit ALU.

The BIU contains the following registers:

¾ IP - the Instruction Pointer

¾ CS - the Code Segment Register

¾ DS - the Data Segment Register

¾ SS - the Stack Segment Register

¾ ES - the Extra Segment Register

The BIU fetches instructions using the CS and IP, written CS: IP, to construct the 20- bit address. Data is fetched using a segment register (usually the DS) and an effective address (EA) computed by the EU depending on the addressing mode.

The EU contains the following 16-bit registers:

¾ AX - the Accumulator

¾ BX - the Base Register

¾ CX - the Count Register

¾ DX - the Data Register

¾ SP - the Stack Pointer

¾ BP - the Base Pointer

¾ SI - the Source Index Register

¾ DI - the Destination Register

8086 ARCHITECTURE MICROPROCESSORS &INTERFACING

These are referred to as general-purpose registers, although, as seen by their names, they often have a special-purpose use for some instructions. The AX, BX, CX, and DX registers can be considered as two 8-bit registers, a High byte and a Low byte. This allows byte operations and compatibility with the previous generation of 8-bit processors, the 8080 and 8085. The 8-bit registers are:

¾ AX --> AH,AL

¾ BX --> BH,BL

¾ CX --> CH,CL

¾ DX --> DH,DL

The ALU performs all basic computational operations: arithmetic, logical, and comparisons. The control unit orchestrates the operation of the other units. It fetches instructions from the on-chip cache, decodes them, and then executes them. Each instruction has the control unit direct the other function units through a sequence of steps that carry out the instruction's intent. The execution path taken by the control unit can depend upon status bits produced by the arithmetic logic unit or the floating-point unit (FPU) after the instruction sequence completes. This capability implements conditional execution control flow, which is a critical element for general-purpose computation. ES CS SS DS IP AH BH CH DH AL BL CL DL SP BP SI DI FLAGS AX BX CX DX

Extra Segment

Code Segment

Stack Segment

Data Segment

Instruction Pointer

Accumulator

Base Register

Count Register

Data Register

Stack Pointer

Base Pointer

Source Index Register

Destination Index Register

BIU registers

(20 bit adder)

EU registers

16 bit arithmetic

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[PDF] 8086 ARCHITECTURE an 8086 family microprocessor is

8086 ARCHITECTURE MICROPROCESSORS &INTERFACING

8086 ARCHITECTURE

8086 Features

¾ 16-bit Arithmetic Logic Unit

¾ 16-bit data bus

¾ 20-bit address bus 1,048,576 = 1 meg

¾ 16 I/O lines so it can access 64K I/O ports

¾ 16 bit flag

¾ It has 14 -16 bit registers

¾ Clock frequency range is 5-10 MHZ

¾ Designed by Intel

¾ Rich set of instructions

¾ 40 Pin DIP, Operates in two modes

8086 ARCHITECTURE MICROPROCESSORS &INTERFACING

The BIU contains the following registers:

¾ IP - the Instruction Pointer

¾ CS - the Code Segment Register

¾ DS - the Data Segment Register

¾ SS - the Stack Segment Register

¾ ES - the Extra Segment Register

The EU contains the following 16-bit registers:

¾ AX - the Accumulator

¾ BX - the Base Register

¾ CX - the Count Register

¾ DX - the Data Register

¾ SP - the Stack Pointer

¾ BP - the Base Pointer

¾ SI - the Source Index Register

¾ DI - the Destination Register

8086 ARCHITECTURE MICROPROCESSORS &INTERFACING

¾ AX --> AH,AL

¾ BX --> BH,BL

¾ CX --> CH,CL

¾ DX --> DH,DL

Extra Segment

Code Segment

Stack Segment

Data Segment

Instruction Pointer

Accumulator

Base Register

Count Register

Data Register

Stack Pointer

Base Pointer

Source Index Register

Destination Index Register

BIU registers

EU registers

16 bit arithmetic