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MCU引脚什么时候会直接与芯片内部地连接?

MCU引脚什么情况会直接与芯片内部地连接?MSP430F44x系列单片机设置I/O为输出,间断性的输出脉冲,一段时间之后,该I/O会直接与PCB板子上的地线导通短路了,会是什么情况?