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我想实现的功能是：
PWM进行互补驱动。当检测到外部一个触发信号为高电平或者低电平后，PWM该周期立刻结束并开始进入下一个周期，从而实现外部信号调频的功能。
请问该功能可以通过什么方式实现呢？谢谢！
