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80186 Microprocessors: Introduction and Architecture

Hello friends, today we are going to discuss the 80186 microprocessor with integrated peripherals. The Intel 80186 is an improved version of the 8086 microprocessor. 80186 is a 16-bit microprocessor with a 16-bit data bus and a 20-bit address bus. It has a programmable peripheral device integrated into the same package. The instruction set of the 80186 is a superset of the instruction set of the 8086. The term super-set means that all of the 8086 instructions will execute properly on an 80186, but the 80186 has a few additional instructions. The following figure shows the block diagram and pin diagram of 80186. The CPU is divided into seven independent functional parts. 80186 internal block diagram  80186 68-pins pin diagram  Functional parts of 80186 Microprocessor The Bus Interface Unit (BIU) Execution Unit (EU) Clock Generator Programmable interrupt controller Programmable Chip Select Unit (CSU) Programmable DMA Unit Programmable counter/timers The Bus Interface Unit
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Decimal Number System

A Decimal Number systems means group of 10 numbers (based on the number 10) from 0 through 9.


The next number is formed by adding 1 to last number i.e. 9 + 1 = 10, again 10 is a combination of existing 0 to 9 numbers. When we write numbers, the position (or "place") of each number is important. The digits in the decimal number 5346 tell you that you have 5 thousands, 3 hundreds, 4 tens, 6 ones. This number system contains decimal point. E. g. 5346.7, 5 thousand, 3 hundred, 4 tens, 6 ones and 7 tenths
                 5    3    4     6     .  7   

                                               103 102 101  100    10-1

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