Control register 2
| SADDR | Slave address |
| DIR | Master data transmission direction |
| ADDR10 | Host send 10-bit address mode enable |
| READH10 | 10-bit address header read enable |
| GENSTART | Generate start condition |
| GENSTOP | Generate stop condition |
| NACKEN | Not acknowledge enable |
| CNT | Transmit data counter |
| RLDEN | Send data reload mode enable |
| ASTOPEN | Automatically send stop condition enable |
| PECTEN | Request PEC transmission enable |