Microcontroller (MCU) is the brain of an embedded system. It is a computer scaled down to a single compact chip for managing a specific operation. It is a highly integrated single chip with a processor, memory, I/O Peripherals, timer/counter and communication ports in it. It includes a range of products offering digital processing under software control. Most important criteria in selecting a MCU for a particular application is the data bus width expressed in bits. MCUs are available in various data widths ranging from 4 to 64 bits. It is used in variety of general and special applications. Applications include domestic appliances, handheld devices, servers, automotive, network infrastructure, image processing and communication.

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