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堆栈指针的入栈／出栈
发生异常时的寄存器运算（入栈和出栈）
Arm® Cortex®-M3在异常／中断处理程序的开始和结束时自动执行入栈和出栈功能。
可自动执行入栈和出栈的寄存器有8个，分别是R00R3、R12、R14、R15和xPSR。
我们来看看发生异常／中断事件时，程序流程示例中的入栈和出栈操作。
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。