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关于ADS1251的clk理解问题

Other Parts Discussed in Thread: ADS1251

ADS1251的clk这个引脚:

1:要一直送一个持续不断的方波,这个IC才能正常工作?

2:还是只是在读取数据的时候送方波就可以?

还有手册上说ADS1251是SPI协议的,那我MCU上SIP外设的CS, CLK ,MOSI ,MISO这4根线如何与ADS1251相连?