Program/erase control register
| PELOCK | FLASH_PECR and data EEPROM lock |
| PRGLOCK | Program memory lock |
| OPTLOCK | Option bytes block lock |
| PROG | Program memory selection |
| DATA | Data EEPROM selection |
| FTDW | Fixed time data write for Byte, Half Word and Word programming |
| ERASE | Page or Double Word erase mode |
| FPRG | Half Page/Double Word programming mode |
| PARALLELBANK | Parallel bank mode |
| EOPIE | End of programming interrupt enable |
| ERRIE | Error interrupt enable |
| OBL_LAUNCH | Launch the option byte loading |