Microprocessor

Intel 8086
Architecture & Programming

Features of 8086 Microprocessor
1) 8086 has 16-bit ALU; this means 16-bit numbers atomic number 18 directly neat by 8086. 2) It has 16-bit selective information bus, so it sens read data or write data to memory or I/O ports either 16 bits or 8 bits at a time.

3)

It has 20 reference point lines, so it can address up to 220 i.e. 1048576 = 1Mbytes of memory (words i.e. 16 bit numbers are stored in consecutive memorylocations). Due to the 1Mbytes memory size concurrent execution is made feasible as well as several(prenominal) multiprogramming features have been incorporated in 8086 design.
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Features Continued …
4) 8086 includes few features, which enhance multiprocessing capability (it can be used with math coprocessors same(p) 8087, I/O processor 8089 etc. 5) Operates on +5v supply and single pattern (single line) clock frequency.(Clock is generated by separate peripheral chip 8284). 6) 8086 comes with assorted versions. 8086 runs at 5 MHz, 8086-2 runs at 8 MHz, 8086-1 runs at 10 MHz. 7) It comes in 40-pin configuration with HMOS technology having around 20,000 transistors in its circuitry.
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Features Continued …
8) It has multiplexed address and data bus like 8085 due to which the pin count is reduced considerably. 9) Higher Throughput (Speed) (This is achieved by a concept called pipelining).




Nowadays 8086 is no longer used. unless the concept of its principles and structures is very useful for understanding other ripe Intel microprocessors.

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Pin Diagram of 8086

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Internal Architecture of 8086

Architecture of 8086 (contd..)
Fetching the next centering while current instruction is under execution is called pipelining. What happens to stand up when jump or call instruction is executed ? When 8086 is readapt the contents of IP are 0000 H and contents of CS are FFFF H. Other registers are cleared to 0000 h.
3/9/2006 Y.H.Dandawate 7...If you want to get a full essay, order it on our website: Orderessay



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