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F28377D管脚Vregenz(119)的作用的电平状态



       最近调试的时候发现系统出现很多奇怪的问题,比如程序运行RESET脚有下拉信号,后来检查发现硬件上的错误Vregenz(119)管脚接到3.3V,手册上推荐接到VDDIO,现在直接把该管脚悬空,系统又没问题了,是否该管脚可以悬空?该管脚的具体功能是什么?