DocID13902 Rev 15 1066/1128
RM0008 Device electronic signature
1067
30.2 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 F7E8
Address offset: 0x00
Read only = 0xXXXX where X is factory-programmed
Address offset: 0x02
Read only = 0xXXXX where X is factory-programmed
Address offset: 0x04
Read only = 0xXXXX XXXX where X is factory-programmed
1514131211109876543210
U_ID(15:0)
rrrrrrrrrrrrrrrr
Bits 15:0 U_ID(15:0): 15:0 unique ID bits
1514131211109876543210
U_ID(31:16)
rrrrrrrrrrrrrrrr
Bits 15:0 U_ID(31:16): 31:16 unique ID bits
This field value is also reserved for a future feature.
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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