STM8S105C4 datasheet(50/121 Pages) STMICROELECTRONICS

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Unique ID

STM8S105x4/6

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DocID14771 Rev 15

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

76543

210

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]

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