Device electronic signature RM0033
1350/1381 RM0033 Rev 9
33 Device electronic signature
The electronic signature is stored in the Flash memory area, and can be read using the
JTAG/SWD or the CPU. It contains factory-programmed identification data that allow the
user firmware or other external devices to automatically match its interface to the
characteristics of the STM32F20x and STM32F21x microcontroller.
33.1 Unique device ID register (96 bits)
The unique device identifier is ideally suited:
• for use as serial numbers (for example USB string serial numbers or other end
applications)
• for use as security keys in order to increase the security of code in Flash memory while
using and combining this unique ID with software cryptographic primitives and
protocols before programming the internal Flash memory
• to activate secure boot processes, etc.
The 96-bit unique device identifier provides a reference number which is unique for any
device and in any context. These bits can never be altered by the user.
The 96-bit unique device identifier can also be read in single bytes/half-words/words in
different ways and then be concatenated using a custom algorithm.
Base address: 0x1FFF 7A10
Address offset: 0x00
Read only = 0xXXXX XXXX where X is factory-programmed
Address offset: 0x04
Read only = 0xXXXX XXXX where X is factory-programmed
313029282726252423222120191817161514131211109876543210
U_ID(32:0)
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
Bits 31:0 U_ID(31:0): 31:0 unique ID bits
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
U_ID(63:48)
rrrrrrrrrrrrrrrr
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
U_ID(47:32)
rrrrrrrrrrrrrrrr
Bits 31:0 U_ID(63:32): 63:32 unique ID bits
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