STM8AL31E8X Datasheet, PDF (65/133 Pages) STMicroelectronics – Automotive 8-bit ultra-low-power MCU, 64 KB Flash, EEPROM, RTC, AES, LCD, timers, USARTs, I2C, SPIs, ADC, DAC, COMPs

STM8AL31E8x STM8AL3LE8x
8
Unique ID
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 are never
altered by the user.
The unique device identifier is 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
7
6
Unique ID bits
5
4
3
2
1
0
0x4926
0x4927
0x4928
0x4929
X co-ordinate on
the wafer
Y co-ordinate on
the wafer
U_ID[7:0]
U_ID[15:8]
U_ID[23:16]
U_ID[31:24]
0x492A Wafer number
U_ID[39:32]
0x492B
0x492C
0x492D
0x492E
Lot number
U_ID[47:40]
U_ID[55:48]
U_ID[63:56]
U_ID[71:64]
0x492F
0x4930
0x4931
U_ID[79:72]
U_ID[87:80]
U_ID[95:88]
DocID027180 Rev 5
65/133
65