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关于引脚的输入输出疑惑

Other Parts Discussed in Thread: CC2530

1.大家都知道stc89c52在读引脚电平的时候需要先写1,请问cc2530在读引脚的时候需要像其他51单片机那样先对该引脚写1再读吗?

2.stc89c52需要外接上拉电阻,否则输出不了高电平1,请问2530输出引脚的时候需要像其它51单片机那样接外部上拉电阻吗?

3.作为输入脚上拉下拉和三态有什么区别?