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28335的pwm口输出对地电压问题请教



使用28335产生pwm,用示波器观测的输出pwm波形如下,

发现 pwm对地电压为5V,发现不正常,dsp的供电才3.3V,何解?

是否是因为PWM输出的高低电平分别为正负2.5V,所以最大电压才是5V?

若是这种情况,那该怎么设置,只有高电平输出和输出为0的PWM波形