MSPM0G3507: failure to clear CANFD RX buffer status

Tool/software:

Hello,

I am trying to receive CAN message from Rx Buffer. But after trying to clear the buffer new data status register, the status can not be cleared. 

From screenshot, the register of NDT2 is still 0x20000000 after the value 0 is written to its address.

From the spec, the register is writable. 

Also I see this in RX buffer handling: "The New Data flags have to be reset by the Host CPU by writing a 1 to the respective bit position." Not sure what it means. I tried to write 0x20000000 to clear the status, and it also doesn't work.

What might be missing in this operation?

Thanks!

Crane