communication configuration register
| IMODE | Instruction mode  |  
| IDTR | Instruction double transfer rate  |  
| ISIZE | Instruction size  |  
| ADMODE | Address mode  |  
| ADDTR | Address double transfer rate  |  
| ADSIZE | Address size  |  
| ABMODE | Alternate byte mode  |  
| ABDTR | Alternate bytes double transfer rate  |  
| ABSIZE | Alternate bytes size  |  
| DMODE | Data mode  |  
| DDTR | Alternate bytes double transfer rate  |  
| DQSE | DQS enable  |  
| SIOO | Send instruction only once mode  |