ARM 公司的 Cortex-M、R、A系之间的联系与区别是什么？
简单来说：它们都是Cortex的内核，是ARMv7的版本(不同于ARM7，ARM7的内核版本是ARMv4)。
Cortex-M系列的是MCU的意思
Cortex-R系列的是RunTime的意思
Cortex-A系列的是Application的意思
A系列可以说是真正的RISC，带有MMU
R系列不带有MMU
M系列完全就是MCU。
ARMv7架构定义了三大分工明确的系列：“A”系列面向尖端的基于虚拟内存的操作系统和用户应用，包括高阶版的ARM Cortex-A9处理器；“R”系列针对实时系统；“M”系列对微控制器和低成本应用提供优化。
ARM核心采用的体系架构列表
The Cortex family of ARM processors provides a range of solutions optimized around specific market applications across the full performance spectrum.
Cortex underlines ARM's strategy of aligning techna-ology around specific market applications and performance requirements.
The ARM Cortex family is comprised of three series, which all implement the Thumb-2 instruction set to address the increasing performance and cost demands of various markets
ARM Cortex-A Series,
Applications processors for complex OS and user applications.
Supports the ARM, Thumb and Thumb-2 instruction sets.
ARM Cortex-R Series
Embedded processors for real-time systems.
Supports the ARM, Thumb, and Thumb-2 instruction sets
ARM Cortex-M Series
Deeply embedded processors
optimized for cost sensitive applications.
Supports the Thumb-2 instruction set only
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