Datasheet

Unique ID STM8L151xx, STM8L152xx
60/131 DocID15962 Rev 13
8 Unique ID
STM8 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 14. Unique ID registers (96 bits)
Address
Content
description
Unique ID bits
76543 2 1 0
0x4926
X co-ordinate on
the wafer
U_ID[7:0]
0x4927 U_ID[15:8]
0x4928
Y co-ordinate on
the wafer
U_ID[23:16]
0x4929 U_ID[31:24]
0x492A Wafer number U_ID[39:32]
0x492B
Lot number
U_ID[47:40]
0x492C U_ID[55:48]
0x492D U_ID[63:56]
0x492E U_ID[71:64]
0x492F U_ID[79:72]
0x4930 U_ID[87:80]
0x4931 U_ID[95:88]