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c6000 mcbsp 配置为uart问题

Other Parts Discussed in Thread: MAX232

想把mcbsp配置为uart使用,参考了文档spra633c.pdf,但是碰到一个问题

mcbsp的输出dx空闲位电平为低电平,这和uart的空闲位(高电平)刚好相反,这样的话是不是需要添加一个反相器?