This chapter introduces some basic concepts, application fields and characteristics of ARM microprocessors, and guides readers into the hall of ARM technology. The main contents of this chapter: - Introduction to ARM and related technologies - Application fields and characteristics of ARM microprocessors - ARM microprocessor series - Architecture of ARM microprocessors - Application selection of ARM microprocessors 1.1 ARM-Advanced RISC Machines ARM (Advanced RISC Machines) can be considered as the name of a company, a general term for a type of microprocessor, or the name of a technology. Founded in Cambridge, UK in 1991, ARM mainly sells licenses for chip design technology. At present, microprocessors using ARM technology intellectual property (IP) cores, which we usually call ARM microprocessors, have spread to various product markets such as industrial control, consumer electronics, communication systems, network systems, and wireless systems. Microprocessor applications based on ARM technology account for more than 75% of the market share of 32-bit RISC microprocessors, and ARM technology is gradually penetrating into every aspect of our lives. ARM is a company that specializes in the design and development of chips based on RISC technology. As an intellectual property supplier, it does not directly engage in chip production. Instead, it relies on the transfer of design licenses to cooperative companies to produce chips with different characteristics. Major semiconductor manufacturers in the world purchase ARM microprocessor cores designed by ARM and add appropriate peripheral circuits according to their different application fields, thus forming their own ARM microprocessor chips to enter the market. At present, dozens of large semiconductor companies around the world use ARM\'s authorization, which not only enables ARM technology to obtain more third-party tools, manufacturing, and software support, but also reduces the cost of the entire system, making it easier for products to enter the market and be accepted by consumers, making them more competitive.
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