FLASH non-secure status register
| EOP | Non-secure end of operation This bit is set by hardware when one or more Flash memory non-secure operation (program/erase) has been completed successfully. This bit is set only if the non-secure end of operation interrupts are enabled (EOPIE = 1 in FLASH_NSCR). This bit is cleared by writing 1. |
| OPERR | Non-secure operation error This bit is set by hardware when a Flash memory non-secure operation (program/erase) completes unsuccessfully. This bit is set only if non-secure error interrupts are enabled (NSERRIE = 1). This bit is cleared by writing 1. |
| PROGERR | Non-secure programming error This bit is set by hardware when a non-secure quad-word address to be programmed contains a value different from all 1 before programming, except if the data to write is all 0. This bit is cleared by writing 1. |
| WRPERR | Non-secure write protection error This bit is set by hardware when an non-secure address to be erased/programmed belongs to a write-protected part (by WRP, PCROP, HDP or RDP level 1) of the Flash memory. This bit is cleared by writing 1. Refer to for full conditions of error flag setting. |
| PGAERR | Non-secure programming alignment error This bit is set by hardware when the first word to be programmed is not aligned with a quad-word address, or the second, third or forth word does not belong to the same quad-word address. This bit is cleared by writing 1. |
| SIZERR | Non-secure size error This bit is set by hardware when the size of the access is a byte or half-word during a non-secure program sequence. Only quad-word programming is allowed by means of successive word accesses. This bit is cleared by writing 1. |
| PGSERR | Non-secure programming sequence error This bit is set by hardware when programming sequence is not correct. It is cleared by writing 1. Refer to for full conditions of error flag setting. |
| OPTWERR | Option write error This bit is set by hardware when the options bytes are written with an invalid configuration. It is cleared by writing 1. Refer to for full conditions of error flag setting. |
| BSY | Non-secure busy This indicates that a Flash memory secure or non-secure operation is in progress. This bit is set at the beginning of a Flash operation and reset when the operation finishes or when an error occurs. |
| WDW | Non-secure wait data to write This bit indicates that the Flash memory write buffer has been written by a secure or non-secure operation. It is set when the first data is stored in the buffer and cleared when the write is performed in the Flash memory. |
| OEM1LOCK | OEM1 lock This bit indicates that the OEM1 RDP key read during the OBL is not virgin. When set, the OEM1 RDP lock mechanism is active. |
| OEM2LOCK | OEM2 lock This bit indicates that the OEM2 RDP key read during the OBL is not virgin. When set, the OEM2 RDP lock mechanism is active. |
| PD1 | Bank 1 in power-down mode This bit indicates that the Flash memory bank 1 is in power-down state. It is reset when bank 1 is in normal mode or being awaken. |
| PD2 | Bank 2 in power-down mode This bit indicates that the Flash memory bank 2 is in power-down state. It is reset when bank 2 is in normal mode or being awaken. |