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MSP430F147接地问题

Other Parts Discussed in Thread: MSP430F147

公司产品智能数显仪表使用MSP430F147驱动,其中62和63分别为模拟和数字接地,试验中,无意将63脚断开(悬空),发现仪表在没有连接485通信的时候,显示正常,可是接上485通信后,屏幕显示会一闪一闪的。为什么会这样的呢?如果有问题应该在没有连接485通信的时候也会闪的啊