Status register 1
| STARTF | Start bit (Master mode) |
| ADDR7F | Address sent (master mode)/matched (slave mode) |
| TDC | Transmit data complete |
| ADDRHF | address header match (Master mode) |
| STOPF | Stop detection (slave mode) |
| RDBF | Receive data buffer full (receivers) |
| TDBE | Transmit data buffer empty (transmitters) |
| BUSERR | Bus error |
| ARLOST | Arbitration lost (master mode) |
| ACKFAIL | Acknowledge failure |
| OUF | Overflow or underflow |
| PECERR | PEC receive error |
| TMOUT | Timeout error |
| ALERTF | SMBus alert |