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28335的中断嵌套问题

请问28335中如果想要实现中断嵌套,能否采用较高优先级的INT3.1去打断较低优先级的INT3.6,即在INT3.6执行中断时,触发INT3.1的中断事件,此时执行INT3.1,暂时将INT3.6挂起。我目前无法实现,可能是什么原因呢?