14.1.4 Radio Transceiver Status Information
Each AT86RF212B SPI access returns the radio transceiver status information as the first byte transmitted by the MISO output while the serial data is shifted into the MOSI input. The radio transceiver status information (PHY_STATUS) can be configured using the SPI_CMD_MODE bits within the TRX_CTRL_1 register (TRX_CTRL_1.SPI_CMD_MODE) to return ether the TRX_STATUS, PHY_RSSI or IRQ_STATUS register.