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F28335和AD7606的连接问题



我现在把AD7606的片选信号 连接到了DSP的xintf的XZCS6  AD7606的RD连接了DSP的XRD 剩下的ADBUSY ADREST和CONVST分别连到了DSP的GPIO 

请问下这样连接可以吗?  为什么我测到的XZCS6一直是高电平呢?  我是需要在程序里给这个引脚拉低吗? 

麻烦大家指导一下~~~~~~~~O(∩_∩)O谢谢