Accessing and modify PHY PHYCFGR register on Ethernet Shield V.2 (W5500)


For my project I need to be efficient powerwise and I am using the Ethernet shield v.2 which has a W5500 chip on it.

I know we can somehow access register and change bit in them but I don't know if that's even possible from the sketch IDE. I want to enable low power mode in PHYCFGR register and it should be possible according to the W5500 datasheet.

I have already install the appropriate library but I am kind of stuck here.

Would appreciate any help

Thank You!

Julien Levesque