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A Microcontroller or MCU (MicroController Unit, sometimes written μC) is an integrated circuit comprising a complete computer on a single silicon chip, albeit generally a relatively simple and low power one. It will contain a processor for executing instructions, program memory, working memory and a range of peripheral devices such as analogue and digital inputs and outputs, timers, counters and communication channels. Microcontrollers are all around us, controlling everything from toasters and washing machines to the door locks and anti-lock brakes in a car as well as all manner of industrial plant and machinery.