Flash option register
| RDP | Read protection level  |  
| nRST_STOP | nRST_STOP  |  
| nRST_STDBY | nRST_STDBY  |  
| IDWG_SW | Independent watchdog selection  |  
| IWDG_STOP | Independent watchdog counter freeze in Stop mode  |  
| IWDG_STDBY | Independent watchdog counter freeze in Standby mode  |  
| WWDG_SW | Window watchdog selection  |  
| nSWAP_BANK | nSWAP_BANK  |  
| DUAL_BANK | DUAL_BANK  |  
| RAM_PARITY_CHECK | SRAM parity check control  |  
| nBOOT_SEL | nBOOT_SEL  |  
| nBOOT1 | Boot configuration  |  
| nBOOT0 | nBOOT0 option bit  |