Only 4 CAN ports avaliable when using RTC Module?

When I connected the RTC Module to CAN_6&4, does it mean that both CAN6 and CAN4 are unavaliable?
Anyone can tell me which port is RTC actually used?

Hi Liang_Qi,

Please refer to the following link:

The script can help you to understand the CAN interface for the RTC module.

Thanks for the help.
I checked and found only can1 which corresponding to CAN6 port is used.

This means we have 5 CAN ports available.