Datasheet

STM8S105xx
Unique ID
9 Unique ID
The devices feature a 96-bit unique device identifier which provides a reference number
that is unique for any device and in any context. The 96 bits of the identifier can never be
altered by the user.
The unique device identifier can be read in single bytes and may then be concatenated
using a custom algorithm.
The unique device identifier is ideally suited:
• For use as serial numbers
• For use as security keys to increase the code security in the program memory while
using and combining this unique ID with software cryptographic primitives and
protocols before programming the internal memory.
• To activate secure boot processes
Table 15: Unique ID registers (96 bits)
Address Content description Unique ID bits
7 6 5 4 3 2 1 0
0x48CD X co-ordinate on the wafer U_ID[7:0]
0x48CE U_ID[15:8]
0x48CF Y co-ordinate on the wafer U_ID[23:16]
0x48D0 U_ID[31:24]
0x48D1 Wafer number U_ID[39:32]
0x48D2 Lot number U_ID[47:40]
0x48D3 U_ID[55:48]
0x48D4 U_ID[63:56]
0x48D5 U_ID[71:64]
0x48D6 U_ID[79:72]
0x48D7 U_ID[87:80]
0x48D8 U_ID[95:88]
DocID14771 Rev 13 41/99