Flash control register
| PG | Programming  |  
| PER | Page erase  |  
| MER1 | Bank 1 Mass erase  |  
| PNB | Page number  |  
| BKER | Bank erase  |  
| MER2 | Bank 2 Mass erase  |  
| START | Start  |  
| OPTSTRT | Options modification start  |  
| FSTPG | Fast programming  |  
| EOPIE | End of operation interrupt enable  |  
| ERRIE | Error interrupt enable  |  
| RDERRIE | PCROP read error interrupt enable  |  
| OBL_LAUNCH | Force the option byte loading  |  
| OPTLOCK | Options Lock  |  
| LOCK | FLASH_CR Lock  |