One-Time Programmable Bytes - ST STM32F413 Reference Manual

Advanced arm-based 32-bit mcus

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One-time programmable bytes

The OTP area is divided into 16 OTP data blocks of 32 bytes and one lock OTP block of 16

bytes. The OTP data and lock blocks cannot be erased. The lock block contains 16 bytes

LOCKBi (0 ≤ i ≤ 15) to lock the corresponding OTP data block (blocks 0 to 15). Each OTP

data block can be programmed until the value 0x00 is programmed in the corresponding

OTP lock byte. The lock bytes must only contain 0x00 and 0xFF values, otherwise the OTP

bytes might not be taken into account correctly.

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

Table 12. OTP area organization

DocID029473 Rev 3

Embedded Flash memory interface

Address byte 0