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将你要写的汇编语句写成一个函数，然后调用就可以了，但只能函数嵌套一次，也就是下面所提到的Leaf Function
CLA Function NestingThe compiler supports 2 level of function calls. Functions declared as interrupts may call leaf functions only. Leaf function may not call other functions. Functions not declared as interrupt will be considered leaf functions.
