CPU执行完–个中断程序块后，将执行和队列中级别最高的中断相关联的程序块。如果CPU在执行某个中断程序块的过程中接收到更高级别的中断，则在执行完和该中断相关的程序块后，继续执行未执行完的那个程序块。如果队列中的多个程序块有相同的中断优先级，则执行顺序不确定。注意:某些函数，如DOIO,BUS_ RD,BUS_ WRT,COMMREQ和某些SVC_ REQ函数会产生一些具有相同优先级的其他队列程序块。

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