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引脚配置问题

Other Parts Discussed in Thread: DP83867IR

如上图所示:

这个是DP8367IR器件引脚配置,就是在上电后,作为输入引脚,来配置相关模式。

图中有两部分:1、电源连接电阻、LED到引脚;2、电源连接上拉电阻到引脚。

个人理解:就是第一种其实也算是上拉,就可以不用第二种了。

这样会出现什么问题呢?