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Atmel ARM-based processors are microcontrollers and microprocessors integrated circuits, by Atmel, that are based on various 32-bit ARM processor cores, with Atmel-designed peripherals and tool support. Atmel's SMART-brand ARM families complements their AVR lines of 8- and 32-bit microcontrollers. The SMART brand includes application-specific ARM-based parts for Wi-Fi, such as the SmartConnect and Smart Direct lines, as well as ARM-based ICs meant for smart energy products such as gas and power meters. The Atmel SMART brand of ARM-based MCUs are found in the Arduino family of single-board computers: Arduino Zero (SAM D21) and Arduino Due (SAM3). The "SAM" moniker in Atmel part numbers stands for "SMART Atmel microcontroller". The SMART line is a key component of Atmel’s Internet of Things (IoT) strategy. The 32-bit ARM cores are well-suited to host the TCP/IP software stack needed to communicate over the Internet. In addition to the microcontrollers needed for IoT, Atmel is using SMART ARM-based chips in several of its Wi-Fi modules and its line of Smart Energy integrated circuits.〔(Atmel product website )〕 Traditionally there has been a tie-in between the Atmel part number and the ARM core that the part is based on. Going forward from 2014, Atmel is disjoining the ARM core labeling from the part number. Hence, the SAM D20 part number has no indication it is based on a ARM Cortex-M0+. ==Overview== ARM licenses the core design for a series of 32-bit processors. ARM does not manufacture any complete silicon products, just intellectual property (IP). The ARM processors are RISC (reduced instruction set computers). This is similar to Atmel’s AVR 8-bit products, a later adoption of RISC architecture. Whereas the AVR architecture used Harvard architecture exclusively, some ARM cores are Harvard (Cortex-M3) and others are Von Neumann architecture (ARM7TDMI). Semiconductor companies such as Atmel take the ARM cores, which use a consistent set of instructions and register naming, and add peripheral circuits such as ADCs (analog to digital converters), clock management, and serial communications such as USART, SPI, CAN, LIN, and I2C. Atmel made efforts to adapt advanced peripherals and power management that used very little power and can operate independently without having the CPU core powered up (sleepwalking). They also provided for DMA between external interfaces and memories increasing data throughput with minimal processor intervention. Atmel sells both MCUs (microcontroller units) that have internal Flash memory, and MPUs (microprocessor units) that use external memory. In addition to the chips themselves, Atmel offers demo boards, both on its website, and through distribution channels such as Digi-key, Element14, Arrow, Avnet, Future Electronics, and Mouser. Some of the "Atmel | SMART"-line of ARM-based products are meant for specific applications, such as their SAM4CP that is used in smart-grid energy meters. There are also Atmel wireless products built on ARM cores, such as the SmartConnect and Smart Direct wireless chips and modules. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Atmel ARM-based processors」の詳細全文を読む スポンサード リンク
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