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DSP28335芯片在默认情况下,所有GPIO端口读到的全都是高电平?

今天当我把GPIO53设置为输出模式时,那么我程序默认情况下,不管程序运行与否,我从CCS监视的该GPIO53状态一直是高电平,我使能与禁止上拉,它都是高电平。

我的疑问来了:是不是DSP28335的GPIO默认情况下都是输出高电平,如果要输出低电平。只能自己在外部电路加强下拉实现?