Status register 1
| SB | Start bit (Master mode) |
| ADDR | Address sent (master mode)/matched (slave mode) |
| BTF | Byte transfer finished |
| ADD10 | 10-bit header sent (Master mode) |
| STOPF | Stop detection (slave mode) |
| RxNE | Data register not empty (receivers) |
| TxE | Data register empty (transmitters) |
| BERR | Bus error |
| ARLO | Arbitration lost (master mode) |
| AF | Acknowledge failure |
| OVR | Overrun/Underrun |
| PECERR | PEC Error in reception |
| TIMEOUT | Timeout or Tlow error |
| SMBALERT | SMBus alert |