Debug Halting Control and Status Register
| C_DEBUGEN | Enable Halting debug  |  
| C_HALT | Halt processor  |  
| C_STEP | Enable single step  |  
| C_MASKINTS | Mask PendSV, SysTick and external configurable interrupts  |  
| S_SNAPSTALL | Snap stall control  |  
| S_REGRDY | Register ready status  |  
| S_HALT | Halted status  |  
| S_SLEEP | Sleeping status  |  
| S_LOCKUP | Lockup status  |  
| S_SDE | Secure debug enabled  |  
| S_RETIRE_ST | Retire sticky status  |  
| S_RESET_ST | Reset sticky status  |  
| S_RESTART_ST | Restart sticky status  |