communication configuration register
| INSTRUCTION | Instruction |
| IMODE | Instruction mode |
| ADMODE | Address mode |
| ADSIZE | Address size |
| ABMODE | Alternate bytes mode |
| ABSIZE | Alternate bytes size |
| DCYC | Number of dummy cycles |
| DMODE | Data mode |
| FMODE | Functional mode |
| SIOO | Send instruction only once mode |
| DHHC | DDR hold half cycle |
| DDRM | Double data rate mode |