One-Time Programmable Bytes; Table 11. Otp Area Organization; Figure 6. Pcrop Levels - ST STM32F446 Series Reference Manual

Advanced arm-based 32-bit mcus

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The deactivation of the SPRMOD and/or the unprotection of PCROPed user sectors can

only occur when, at the same time, the RDP level changes from 1 to 0. If this condition is not

respected, the user option byte modification is canceled and the write error WRPERR flag is

set. The modification of the users option bytes (BOR_LEV, RST_STDBY, ..) is allowed since

none of the active nWRPi bits is reset and SPRMOD is kept active.

The active value of nWRPi bits is inverted when PCROP mode is active (SPRMOD =1).

If SPRMOD = 1 and nWRPi =1, then user sector i of bank 1, respectively bank 2 is

read/write protected (PCROP).

One-time programmable bytes

shows the organization of the one-time programmable (OTP) part of the OTP area.

RM0390 Rev 4

Embedded Flash memory interface

Address byte 0

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