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F280049C芯片，配置了4组PWM4,5,6,7输出，配置输出100K方波，配置完全相同，现在PWM4,5,6输出正常，PWM7（GPIO28,29）输出不正常,PWM7(GPIO28,29)配置为PWM时输出高电平电压只有1.7V左右，配置为普通IO输出时，输出高电平电压为3.3V。实测图形如下：2通道为PWM6正常输出，1通道为PWM7不正常输出，PWM7不仅输出电压偏低，而且输出波形也不是0.5方波。
