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TM4C123GH6PM launchpad PD1和PB7连接,输出电平不准



我用PD1和PD0输出电平,发现有电平在高低之间,电平不准确,查看launchpad的手册发现这两个引脚和PB7,PB6用一个0欧姆的电阻相连,而我的程序中PB端口都未使能,请问电平不准是否和这个有关,如果是,我要如何才能独立的使用PB和PD端口,如果不是那是什么原因呢?  另外把这几个引脚连起来是什么用意呢?