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为什么进不了中断



我用的是F2274,在程序正常跑的时候仿真可以进入IO中断,可是在LPM3后进不去,IO中断程序独立测试过又没有问题,有没有人知道是怎么回事啊,我用的是P1.0口中断,定时器可以进入中断的