When the header byte, data byte, or commandstrobe is sent on the SPI interface, the chipstatus byte is sent by the CC1101 on the SO pin.The status byte contains key status signals,useful for the MCU. The first bit, s7, is theCHIP_RDYn signal; this signal must go lowbefore the first positive edge of SCLK. TheCHIP_RDYn signal indicates that the crystal isrunning