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TMS320C6748: 裸机中断问题

Part Number: TMS320C6748


目前使用6748做裸机开发有出现这样的问题:
我在GPIO上绑定了一个中断,优先级为INT11;在timer上绑定另一个中断,优先级为INT9。按理GPIO的中断优先级比较低,当在响应低优先级中断的时候是不是可以响应高优先级中断的。但是现在在响应优先级较低的GPIO中断时,不能再响应优先级较高的timer中断。请问这是为什么?