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请问DSP28335的GPIO作输入时的电平范围

电路板设计时有些欠考虑,GPIO前级经过光耦隔离。

当光耦输入端没有信号时,GPIO输入上拉至3.3V高电平;而当光耦前级输入有信号时,GPIO口的电平为1.2V左右。

查阅28335的datasheet知,28335的GPIO低电平为0-0.8V,高电平为2V以上,想知道如果现在电平(1.2V)在非法区间的话,会被误判成高电平么?