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ADS1198接收的数据起始24bit数据与芯片手册不符合

Other Parts Discussed in Thread: ADS1198

您好,我使用单片机驱动ADS1198,根据芯片手册上说DRDY拉低后最先发送的24个状态位是:1100+LOFF_STATP+LOFF_STATN+BIT[4:7] of the GPIO Register.(Page 27)

我的实际情况是0000+11111111+00000000+BIT[4:7] of the GPIO Registe。也就是说最后4位输出是正确的,LOFF的值由于我把脱落检测功能关了,所以不能确定,疑惑的是前4位和芯片手册上不符合,请问为什么会存在这样的问题?