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DM368的中断问题



请问一下,我在使用DM368的键盘扫描模块的时候,用查询方式工作正常,用中断模式的话中断来几次后就不来了,请问是什么原因?另外,我还发现DM368的中断标志寄存器不能清0(往对应中断位写1),读出来总是1,写1进去没效果,请问如何清除中断标志位?