Channel Status Register
| RXRDY | Receiver Ready (cleared by reading US_RHR) |
| TXRDY | Transmitter Ready (cleared by writing US_THR) |
| OVRE | Overrun Error (cleared by writing a one to bit US_CR.RSTSTA) |
| LSFE | LON Short Frame Error |
| LCRCE | LON CRC Error |
| TXEMPTY | Transmitter Empty (cleared by writing US_THR) |
| UNRE | Underrun Error |
| LTXD | LON Transmission End Flag |
| LCOL | LON Collision Detected Flag |
| LFET | LON Frame Early Termination |
| LRXD | LON Reception End Flag |
| LBLOVFE | LON Backlog Overflow Error |