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操作模式和堆栈指针（1）
Arm® Cortex®-M3有两个特权（特权／非特权）和两种操作模式（线程／处理者）。
对于嵌入式使用，可以选择只有特权级别的基本配置或在特权和非特权之间切换的配置。
在特权／非特权级别下，通过在分配给寄存器R13的主栈指针（MSP）与进程栈指针（PSP）之间切换，堆栈区域可由操作系统内核以及用户例程等处理功能分离和管理。
第Ⅱ章：Arm® Cortex®-M3
* Arm和Cortex是Arm有限公司（或其子公司）在美国和／或其它国家的注册商标。