Datasheet

Unique ID STM8S105x4/6
50/121 DocID14771 Rev 15
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 byte 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 14. Unique ID registers (96 bits)
Address
Content
description
Unique ID bits
76543210
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]