Interrupt and Status register
| TXE | Transmit data register empty (transmitters) |
| TXIS | Transmit interrupt status (transmitters) |
| RXNE | Receive data register not empty (receivers) |
| ADDR | Address matched (slave mode) |
| NACKF | Not acknowledge received flag |
| STOPF | Stop detection flag |
| TC | Transfer Complete (master mode) |
| TCR | Transfer Complete Reload |
| BERR | Bus error |
| ARLO | Arbitration lost |
| OVR | Overrun/Underrun (slave mode) |
| PECERR | PEC Error in reception |
| TIMEOUT | Timeout or t_low detection flag |
| ALERT | SMBus alert |
| BUSY | Bus busy |
| DIR | Transfer direction (Slave mode) |
| ADDCODE | Address match code (Slave mode) |