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DSP实现内部触发Trip Zone 功能,关断PWM的问题

想实现的功能:用28032的DSP的AD脚检测外部模拟信号,当该检测到信号的值大于某一个值时,把某一路的PWM输出管脚XA和XB设置不同的电平值,禁止PWM输出。实现此功能如何设置寄存器?有这方面的例子么?