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在使用ADS1271时，已经将FORMAT管脚接地，即工作在SPI模式下。可是通过示波器观察DRDY引脚的输出发现它的波形如图所示。与芯片手册上给出的SPI模式下DRDY引脚的输出波形不一致（却与FSYNC模式下的波形一致）。这是为什么啊？
