中断触发的程序块可以调用其他的程序块。中断驱动执行时的应用程序堆栈不同于正常的模块化程序执行时的堆栈。特别的，嵌套调用限制不同于从_MAIN块调用的情况。如果一个调用导致堆栈空间不足，无法完成调用，CPU会记录为“堆栈溢出故障”。
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