RL78/G16的硬件手册有如下的说明：
Caution The input buffer is enabled even if the type 7-1-2 pin is operating as an output when the N-ch open drain output mode is selected by the corresponding bit in the port output mode register (POMxx).This may lead to a through current flowing through the type 7-1-2 pin when the voltage level on this pin is intermediate.
问题1、type 7-1-2有这样的注意点，而type 7-3-1或其它type却没这样的注意点。为什么？
问题2：type 7-1-2的情况下，有什么规避的方法对策？