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ads8363,模式4的情况下不能实现4通道

Other Parts Discussed in Thread: ADS8363

RT
ads8363,m1=m0=1,mode4,寄存器输入信号sdi恒为0,
rd和convst的信号都是在clk的上升沿出发一个周期的高电平
本来应该是四通道采样
但是结果只有A的两个通道有效,串行数据2位地址,高位(ch0,1)为00110011……,低位(cha,b)恒为0(有时莫名恒为1)
真心找不到原因啊
求大侠指点啊