ST25DV04K datasheet(48/200 Pages) STMICROELECTRONICS

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5.6

Data Protection

ST25DVxxx provides a special data protection mechanism based on passwords that unlock security sessions.

User memory can be protected for read and/or write access and system configuration can be protected from write

access, both from RF and I2C assess.

5.6.1

Data protection registers

Table 43. RFA1SS access

I2C

Command

Type

Address

Type

Read Configuration (cmd code A0h) @04h

Write Configuration (cmd code A1h) @04h

R always, W if RF configuration security

session is open and configuration not

locked

E2 = 1, 0004h

R always, W if I2C security

session is open

Table 44. RFA1SS

Bit

Name

Function

Factory Value

b1-b0

PWD_CTRL_A1

00: Area 1 RF user security session can’t be open by password

01: Area 1 RF user security session is open by RF_PWD_1

10: Area 1 RF user security session is open by RF_PWD_2

11: Area 1 RF user security session is open by RF_PWD_3

00b

b3-b2

RW_PROTECTION_A1

00: Area 1 RF access: Read always allowed / Write always allowed

01: Area 1 RF access: Read always allowed, Write allowed if RF user security

session is open

10: Area 1 RF access: Read always allowed, Write allowed if RF user security

session is open

11: Area 1 RF access: Read always allowed, Write always forbidden

00b

b7-b4

RFU

0000b

Note:

Refer to Table 11. System configuration memory map for the RFA1SS register.

Table 45. RFA2SS access

I2C

Command

Type

Address

Type

Read Configuration (cmd code A0h) @06h

Write Configuration (cmd code A1h) @06h

R always, W if RF configuration security

session is open and configuration not

locked

E2 = 1, 0006h

R always, W if I2C security

session is open

ST25DV04K ST25DV16K ST25DV64K

Data Protection

DS10925 - Rev 9

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