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利用PWM产生中断的时候，PWM1、PWM2、PWM3的周期相同，我每个周期CTR = PRD时产生一个中断，需要对三个PWM子模块都中断使能吗？还是利用其中一个就好了？
Eric： 如果你只需要一个周期中断，那么只用PWM1的周期中断就可以了。
