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TMS320F28377的AD口作峰值控制

看其datasheet,AD口可以复用为比较器的输入端,有的复用为P端,有的复用为N端。那我现在做移相控制,采样电流的瞬时值,而比较值则是由电压环产生(软件内部产生),那么我使用时要怎么接线呢?我的电流信号只占用一个端子,如何利用P端与N端呢?