F1F=B_0x0, RF1L=B_0x0
FDCAN Rx FIFO 1 status register
| F1FL | Rx FIFO 1 fill level |
| F1GI | Rx FIFO 1 get index |
| F1PI | Rx FIFO 1 put index |
| F1F | Rx FIFO 1 full 0 (B_0x0): Rx FIFO 1 not full 1 (B_0x1): Rx FIFO 1 full |
| RF1L | Rx FIFO 1 message lost 0 (B_0x0): No Rx FIFO 1 message lost 1 (B_0x1): Rx FIFO 1 message lost, also set after write attempt to Rx FIFO 1 of size 0 |