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关于PWM波形的产生问题



需要产生如下的四个周期为8ms的PWM波形,一种方案是利用EVA和EVB中的T1,T2,T3,T4四个定时器通过改变不同的计数初值采用连续增的模式,但这样做有点浪费资源,现在想只利用EVA,后面三个波形采用连续增减模式,该如何操作???