Hello Murali,
I hope all is great with you.
The RF embedded module (RFM) in the FXTH87 consists of an RF output driver for an antenna and a hardware data buffer for automated output or direct control from the MCU.
For further information, I do recommend reviewing the chapter 3.2 from the FXTH87 Family Evaluation Design Reference Manual.
I hope this information helps.
Regards,
David
