I. ARM Processor
ARM (Advanced RISC Machines) microprocessors are microprocessors that use ARM technology intellectual property (IP) cores. This ARM core technology is licensed from ARM Ltd., a British company. ARM Ltd. specializes in the design and development of chips based on RISC technology. As an intellectual property provider, it does not directly engage in chip manufacturing. Instead, it licenses its designs to partner companies to produce chips with unique features. Major semiconductor manufacturers worldwide purchase ARM microprocessor cores designed by ARM Ltd. and add appropriate peripheral circuits according to their different application areas to create their own ARM microprocessor chips for the market.
As a type of embedded system microprocessor, ARM microprocessors have been widely used in various product markets such as industrial control, consumer electronics, communication systems, network systems, and wireless systems. They account for more than 75% of the market share of 32-bit RISC microprocessors, and ARM technology is gradually penetrating into all aspects of our lives.
II. Advantages of ARM processors
Currently, the world is moving towards the Internet of Things (IoT) and artificial intelligence (AI). With the development and advancement of IoT and AI technologies, microprocessor technology is also constantly innovating, and the application of various new microprocessors is becoming increasingly widespread. Given the current proliferation of 32-bit embedded applications, ARM embedded technology is widely used in many embedded system designs. It is precisely because ARM processors possess numerous advantages that they have achieved such widespread adoption.
1. Small size, low power consumption, low cost, and high performance
ARM processors, due to their small size and space-saving design, are perfectly suited for embedded applications. ARM maintains its leading position in embedded performance while striving for the lowest power consumption. Previously, ARM released a new processor called "Cortex-M0," whose biggest feature is its world-leading size and lowest power consumption. The advantage of the ARM architecture is its ability to balance performance, power consumption, code density, and price effectively.
2. Faster instruction execution speed, fixed instruction length
The ARM processor has 37 registers, divided into several banks. These registers include: 31 general-purpose registers, including the program counter (PC pointer), all of which are 32-bit registers; and 6 status registers, used to identify the CPU's operating status and the program's running status, all of which are 32-bit, but only a portion of them are currently in use.
Compared to ARM code, it can save 30% to 40% or more of storage space, while retaining all the advantages of 32-bit code.
3. Excellent compatibility with 8-bit/16-bit devices
ARM microprocessors in newer architectures support two instruction sets: the ARM instruction set and the Thumb instruction set. ARM instructions are 32-bit long, while Thumb instructions are 16-bit long. The Thumb instruction set is a subset of the ARM instruction set, but is equivalent to...
4. A wide range of selectable chips
ARM is not a chip manufacturer; it licenses its technology to semiconductor producers. Currently, almost all semiconductor manufacturers worldwide purchase various ARM cores from ARM, combining them with different controllers (such as LCD controllers, SDRAM controllers, DMA controllers, etc.) and peripherals and interfaces to produce a variety of ARM-based chips. There are currently hundreds of ARM-based processor models available. In the domestic market, common manufacturers include ST, TI, NXP, Atmel, Samsung, OKI, Sharp, Hynix, and Crystal. Users can select the most suitable chip from among these specific models to design their application systems based on their specific application requirements, considering performance and functionality. Because the ARM core uses an upward-compatible instruction set, user-developed software can be easily ported to higher-level ARM platforms.
After a long period of development, ARM processors have become capable of competing with Intel's Atom processors, even in demanding applications like netbooks and tablets. Apple's iPad uses a deeply customized ARM processor architecture, and ARM-based processors are also used in Android tablets and many smartphones. With the advent of the Internet of Things (IoT), ARM-based processors will play an even more prominent role.
