Configuration B Register
| EM | Enable bit Mask (EB bit clear mask) |
| SS | Stop Status (stop status notification) |
| EI | Error Interrupt (unsuccessful transfer completion interrupt enable) |
| RD | Reload Destination |
| RS | Reload Source |
| RC | Reload Count (BC/TC reload) |
| FD | Fixed Destination |
| FS | Fixed Source |
| TW | Transfer Width |
| MS | Mode Select |