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TMS320C6455 GPIO问题



在C6455中, 用GP11 作为外部中断,配置GP11为输入,上升沿采样。当不配置GP12~GP15中的任何一个时,当外部的上升沿来到时,GP11中断产生;但是只要配置GP12~GP15中的任意一个为输出时,当外部中断来到,GP11进不了中断,请问是什么原因。

ps:AE5已经硬件下拉,GP12~GP15管脚为GPIO,而且把GP11换为GP7是一样的效果。