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An embedded system or embedded computer system is a computer system which is designed to perform one or more tasks related to a particular real time application with application specific microcontroller or microprocessor based circuitry embedded in it.They are aimed at providing responses within a set deadline by the manufactured who would have deviced it from customers point of view.

In contrast,general purpose computer system is a computer system which is designed to perform one or more tasks related to general purpose applications with a general purpose microprocessor based circuitry either existing as a separate unit(as in desktop) or embedded(as in palmtop,laptop).They are mainly aimed at providing maximum throughput(Throughput refers to measure of system's execution efficiency in instructions per second).A general purpose computer is a non-real time system,in the sense it need not meet deadlines.A general purpose computer is built around various embedded peripherals such as mouse,printer, router,scanner,etc.Real time system refers to a system which responds to any user input with minimum latency.Since PC's are surrounded by embedded peripherals they cannot come under category of embedded systems because of the following reason:

They require a external reset by the user when system hangs.whereas in embedded systems an on chip WDT (WatchDogTimer ,also referred to as COP[ComputerOperatingProperly]timer automatically resets the system under such condition.

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