PHY

Radio physical layer (PHY) provides functions for radio transceiver access.

Some of them are accessible only by the network layer (request to send data, data indication); some of them can be used from the application (channel selection, random number generation, energy detection, etc.)

Modules
	ATMEGARFR2 PHY Layer
	The ATmega256RFR2 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture combined with a high data rate transceiver for the 2.4 GHz ISM band.