Table 10. Access Versus Read Protection Level - ST STM32F446 Series Reference Manual

Embedded Flash memory interface
--
Memory area
Main Flash Memory
Option Bytes
OTP
1. The main Flash memory is only erased when the RDP changes from level 1 to 0. The OTP area remains unchanged.
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Table 10. Access versus read protection level

Debug features, Boot from RAM or
Protection
from System memory bootloader
Level
Read
Level 1
Level 2
Level 1
Level 2
Level 1
Level 2
Write Erase
(1)
NO NO
NO
YES
NO
NO NA
NO NA
RM0390 Rev 4
Booting from Flash memory
Read Write
YES
YES
YES
NO
YES
YES
RM0390
Erase
NA
NA