CC3000 Serial Port Interface (SPI) - Texas Instruments Wiki
(1) CLCK provides a clock to the SPI interface on the CC3000 device. (2) nCS selects a CC3000 device, indicating that a master wants to communicate to the CC3000 device. MISO is not set to Hi-Z when nCS is deasserted. (3) IRQ is a dual-purpose slave to th...