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ST25DV04K Datasheet(PDF) 80 Page - STMicroelectronics |
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ST25DV04K Datasheet(HTML) 80 Page - STMicroelectronics |
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80 / 220 page  ST25DVxxx specific features ST25DV04K ST25DV16K ST25DV64K 80/220 DocID027603 Rev 4 For blocks 0 and 1 (Bytes 0000h to 0007h in I2C user memory), lock status can also be read in the LOCK_CCFILE register. 5.6.4 System memory protection By default, system memory (static registers) is write protected, both in RF and I2C. I2C host must open the I2C security session (by presenting a valid I2C password) to enable write access to system configuration static registers. I2C host doesn’t have read or write access to RF passwords. By default, I2C host can read all system configuration static registers (except RF passwords) In RF, to enable write access to system configuration static registers, RF user must open the RF configuration security session (by presenting a valid RF password 0) and system configuration must not be locked (LOCK_CFG=00h). RF doesn’t have read or write access to I2C password. By default, RF user can read all system configuration static registers, except all passwords, LOCK_CCFILE, LOCK_DSFID and LOCK_AFI. RF configuration lock: • RF write access to system configuration static registers can be locked by writing 01h in the LOCK_CFG register (by RF or I2C). • RF user cannot unlock system configuration if LOCK_CFG=01h, even after opening RF configuration security session (only I2C host can unlock system configuration). • When system configuration is locked (LOCK_CFG=01h), it is still possible to change RF passwords (0 to 3). Device identification registers: • AFI and DFSID registers can be independently locked by RF user, issuing respectively a Lock AFI and a Lock DSFID command. Lock is definitive: once locked, AFI and DSFID registers cannot be unlocked (either by RF or I2C). System configuration locking mechanism (LOCK_CFG=01h) does not lock AFI and DSFID registers. • Other device identification registers (MEM_SIZE, BLK_SIZE, IC_REF, UID, IC_REV) are read only registers for both RF and I2C. |
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