我在做串口透传，需要P05引脚在串口发送数据时候为低电平。P05我配置为上拉，已经禁用流控制。但是用逻辑分析仪200MHz的采样时间，发现在串口发送数据时，P05会不定期的有一个10ns的高电平（用低的采样时间有可能无法发现），而且高电平的出现在TX上升沿后。请问这是为什么？
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