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比如ARM Cortex-M4 内核的与ARM9的有何区别，在设计时选用时改如何选择？
简单的说,M4无法跑操作系统，偏向于控制，就是个高级点的单片机。ARM9应用于人机互动要求较高的场合。比如平板，手机等。可以跑操作系统。
