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外部中断不响应



程序中使用外部中断XINT1,之前可以正常响应,后来在程序中增加了一条控制PWM信号快速关断的语句 EPwm2Regs.AQCSFRC.bit.CSFB=1; ,增加这条语句之后再进行程序调试时发现XINT的中断不能被响应了,请问各位这是什么原因?谢谢~