ST25DV04K datasheet(58/200 Pages) STMICROELECTRONICS

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Figure 23. I2C security sessions management

VCC

OFF

VCC ON

VCC OFF

I2C security

session closed

I2C_SSO=00h

I2C security

session opened

I2C_SSO=01h

Present

I2C_PWD not OK

Any other

command

Present

I2C_PWD

Any other

command

5.6.3

User memory protection

On factory delivery, areas are not protected.

Each area can be individually protected in read and/or write access from RF and I2C.

Area 1 is always readable (from RF and I2C).

Furthermore, RF blocks 0 and 1 (I2C bytes 0000h to 0007h) can be independently write locked.

User memory protection from RF access

In RF mode, each memory area of the ST25DVxxx can be individually protected by one out of three available

passwords (RF password 1, 2 or 3), and each area can also have individual Read/Write access conditions.

For each area, an RFAiSS register is used to:

•

Select the RF password that unlock the RF user security session for this area

•

Select the protection against read and write operations for this area

(See Table 44. RFA1SS, Table 46. RFA2SS, Table 48. RFA3SS, and Table 50. RFA4SS for details about available

read and write protections).

Note:

Setting 00b in PWD_CTRL_Ai field means that RF user security session cannot be open by any password for

the corresponding area.

When updating RFAiSS registers, the new protection value is effective immediately after the register write

completion.

ST25DV04K ST25DV16K ST25DV64K

Data Protection

DS10925 - Rev 9

page 58/200

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