SR2
| MSL | Master/slave  |  
| BUSY | Bus busy  |  
| TRA | Transmitter/receiver  |  
| GENCALL | General call address (Slave mode)  |  
| SMBDEFAULT | SMBus device default address (Slave mode)  |  
| SMBHOST | SMBus host header (Slave mode)  |  
| DUALF | Dual flag (Slave mode)  |  
| PEC | acket error checking register  |