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请问mcbsp接受AD(IIS信号)，mcbsp配置为只接受从模式，时钟信号，帧信号，数据都由AD产生，寄存器配置了RCR、PCR、SPCR外还需要配置什么呀？直流信号输出是这样怎么回事啊？
直流信号输出是这样怎么回事啊？