ST25TV02K datasheet(20/90 Pages) STMICROELECTRONICS

20 / 90 page

5.6

TruST25 digital signature

ST25TV02K/512 support TruST25 digital signature, a feature that allows to verify the authenticity of the device,

based on a unique digital signature.

TruST25 solution encompasses secure industrialization processes and tools deployed by STMicroelectronics to

generate, store and check the signature in the device.

Table 21. KID

Bit

Command

Read Cfg (cmd code A0h) @7h

Type

Name

Function

Factory value

b7-b0

KID

Contains a key identifier used for TruST25 digital signature

identification and possible revocation.

ST key number

Note:

Refer to Table 4. System configuration memory map accessible through write_cfg and read_cfg commands for

the KID register.

5.7

Counter

5.7.1

Counter registers

Counter configuration

Table 22. CNT_CFG

Bit

Command

Read Cfg (cmd code A0h) @3h

Write Cfg (cmd code A1h) @3h

Type

R: always possible

W: if RF configuration security session is open (the proper configuration password has been

presented before) and configuration not locked.

Name

Function

Factory value

CNT_EN

Counter enable

0: counter is disabled

1: counter is enabled on successful write operation (one increment

per RF session)

CNT_CLR

Counter clear:

0: don’t care

1: counter is cleared and automatically disabled (CNT_EN is put to 0)

This bit is self-cleared

b7-b2

RFU

000000b

Note:

Refer to Table 4. System configuration memory map accessible through write_cfg and read_cfg commands for

the CNT_CFG register.

Counter value

Table 23. CNT_VAL

Bit

Command

Read Cfg (cmd code A0h) @4h

ST25TV02K ST25TV512

TruST25 digital signature

DS12074 - Rev 11

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