STM8L151C4 datasheet(62/142 Pages) STMICROELECTRONICS

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Unique ID

STM8L151x4/6, STM8L152x4/6

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DocID15962 Rev 15

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

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]

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