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CLA中断无法响应对EPWM寄存器的修改

我在CLA的TASK6中断中直接对EPWM1的周期寄存器赋值,可是PWM根本没有变化,请问是什么原因呢?中断是可以进去的,因为在中断中对一变量累加计数,可以看到该变量在一直变化。