An embedded system uses a microprocessor to control a specific function without being programmed by the end user like a PC. Many embedded systems are based on PC hardware and software due to its accessibility. Microprocessors are widely used in embedded systems as they can replace discrete logic circuits, provide functional and maintenance upgrades, improve performance, protect intellectual property, and replace analogue circuits.

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Microprocessors

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 An embedded system is a microprocessor-based
system that is built to control a function or
range of functions and is not designed to be
programmed by the end user in the same way
that a PC is.
 However, PCs have provided an easily
accessible source of hardware and software for
embedded systems and it should be no surprise
that they form the basis of many embedded
systems.

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Reasons for the widespread use of
microprocessors:
1. Replacement for discrete logic-based circuits
2. Provide functional upgrades
3. Provide easy maintenance upgrades
4. Improves mechanical performance
5. Protection of intellectual property
6. Replacement for analogue circuits