看了参考手册，对于开漏推挽输出的描述如下：
• The output buffer is enabled:
– Open drain mode: A “0” in the Output register activates the N-MOS whereas a “1”
in the Output register leaves the port in Hi-Z (the P-MOS is never activated)
– Push-pull mode: A “0” in the Output register activates the N-MOS whereas a “1” in
the Output register activates the P-MOS
怎么会是0低电平的时候N-MOS导通的，按道理nmos的特性，vgs大于一定的值就会导通，怎么反而是低电平导通了？
1高电平的时候，pmos反向变成低电平，pmos导通，nmos不反向，nmos高电平此时也会导通的。
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