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为什么MSP430F427的SD16模块工作很不稳定啊

用的是官方的例程,使用A0+ A0-作为差分输入,把这两端短路,设置的是SD16DF数据格式输出,得出结果不是0左右的数据,是 7FXX左右的读数

为什么呢