For years, 32-bit devices have defined the top of the microcontroller (MCU) food chain, providing a mix of processing, memory and I/O on a single chip. They are essentially the most advanced engine for embedded systems before moving onto to a microprocessor (MPU)-type device, and all the baggage MPUs bring with them. And as embedded systems have evolved, so too have 32-bit MCUs. The most significant trends in recent years have been the addition of wireless connectivity and advanced security.
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