Architecture of 80286 microprocessor
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The document discusses the Intel 80286 microprocessor. It was introduced in 1982 as the 5th generation of Intel's x86 family. It had several improvements over the 8086 including a faster clock speed of 12.5MHz, more transistors at 125K, and an advanced memory management system. The 80286 could address up to 16MB of memory and had two operating modes: real address mode for compatibility and protected virtual address mode for multitasking. It also introduced the ability to use virtual memory in protected mode.
Architecture of 80286 microprocessor
- 1. Architecture of 80286 Microprocessor
- 2. By Syed Ahmed Zaki ID:131-15-2169
- 3. What is microprocessor? The microprocessor is a multipurpose, programmable device that accepts digital data as input, processes it according to instructions stored in it’s memory and provide results as output. It is an example of digital logic and it uses binary and hexadecimal numerical systems
- 4. Intel 80286 microprocessor • Introuduced in 1982 • 5th of i86 family • Faster clock speed than previous versions (12.5 MHz clock speed vs 10MHz) • 16-bit microprocessor as like 8086 • 125K transistors, HMOS III technology • Advanced Memory management • Multitasking Ability • Better Pipelining method • 4 independent functional unit in internal architecture
- 5. Comparison of 80286 among some other microprocessors of Intel family Microprocessor Data bus width Address bus width Memory size 8086 16 20 1M 80186 16 20 1M 80286 16 24 16M 80386 DX 32 32 4G 80486 32 32 4G Pentium 4 & core 2 64 40 1T
- 6. 80286 Salient features • Two mode of operation • More Addressable Memory • Virtual Memory in Protected Mode
- 7. Feature 1: Operating Modes Intel 80286 has 2 operating modes. 1. Real address mode. 2. Protected Virtual address mode. Real Address Mode : 80286 just act as a faster version of 8086 And program for 8086 can be executed without modification in 80286 Protected Virtual Address Mode: 80286 supports multitasking Able to run several program at the same time Able to protect memory space for another program
- 8. Feature 2: More Addressable Memory • In protected mode 80286 can address 16 megabytes of physical memory • Where 8086 can address only 1 megabyte
- 9. Feature 3: Virtual Memory in Protected Mode • 80286 can treat external storage as it were physical memory • Execute programs that are too large to be contained in physical memory • Program can be upto 230 bytes
- 10. Functional Parts 1. Address unit 2. Bus unit 3. Instruction unit 4. Execution unit Where 8086 has only two functional parts
- 11. Internal Block Diagram of 80286
- 12. Register organization of 80286 The 80286 CPU contains almost the same set of registers, as in 8086. 1. Eight 16-bit general purpose registers. 2. Four 16 bit segment registers. 3. Status and control register. 4. Instruction pointer.
- 13. Graphical View of 80286 Registers
- 14. Flag Registers
- 16. Conclusion • 80286 took vital role for today’s high end desktop pc’s.Now we have many high end processors for desktop,notebook,laptop ,mobile phone etc
- 17. References: 1. Asssembly Language Programming and Organization IBM Pc Ytha Yu, Charles Marut 2. Microprocessors & Interfacing: Programming & Hardware. D.V Hall 3. The Intel microprocessors : 8086/8088, 80186/80188, 80286, 80386, 80486, Pentium, Pentium Pro Processor, Pentium II, Pentium III, and Pentium4 : architecture, programming, and interfacing Barry B Brey
- 18. The End