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Embedded firmware is specialized software that controls the work of the microcontroller. Firmware can also be installed on microprocessors and FPGA, but in this article, we will only discuss the challenges of embedded firmware development for microcontrollers. Firmwares differ in complexity and size depending on what device they are developed for. Real-time embedded systems are divided into four types: real-time, networked systems, mobile systems, stand-alone embedded systems, and networked embedded systems.