What are the differences between the architecture a, R and m of arm V7, and in which fields are they applied?

ARM v7 The architecture of can be divided into A, R, M Three versions （ style ）

Contex-A series oriented Application processor cores for dense systems . Top master , On the cell phone , Flat ,GPS Universal application , Mobile device chip 90% Is to use arm. And arm9 and arm11 Corresponding , Can run the operating system, such as linux etc. .

Contex-R series oriented High performance kernel for real-time applications . It is mainly used in occasions with high real-time performance , Such as hard disk controller 、 On board control products .

Contex-M series oriented Microcontroller cores for various embedded applications ( Equivalent to advanced single chip microcomputer ). Mainly used in industry 、 The consumer sector . And arm7 be similar , You can't expand the operating system （ Can only run similar uCos2 Real-time operating system ）.