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AD无法进行,为什么呢?

Other Parts Discussed in Thread: MSP430F5529

使用的是MSP430F5529开发板,外部正弦信号通过P6.7管脚进行AD转换。

如上图所示设置寄存器,能够进入如下图的中断

我想设置参考电压为正负2.5v,如下图

结果就进不了中断了,怎么回事呢?