I am configuring LFRCO as RTCC clock instead of LFXO what all implications i can face in future ?
Is it good to go with LFRCO?
If you need to keep accurate time over temperature then you need to use LFXO which may have an initial error plus variation over temp of 20 - 40 ppm/C. There is also time drift associated with this.
LFRCO, which is designed to be a low power but not precision clock, is typically 15 - 20 x worse than this on temp drift.
What do you really need?