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M24LR04E-R Datasheet(PDF) 25 Page - STMicroelectronics |
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M24LR04E-R Datasheet(HTML) 25 Page - STMicroelectronics |
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25 / 142 page  M24LR04E-R System memory area Doc ID 022208 Rev 5 25/142 ● Present-sector password: The Present-sector password command is used to present one of the three passwords to the M24LR04E-R in order to modify the access rights of all the memory sectors linked to that password (Table 8) including the password itself. If the presented password is correct, the access rights remain activated until the tag is powered off or until a new Present-sector password command is issued. If the presented password value is not correct, all the access rights of all the memory sectors are deactivated. ● Sector security status byte area access conditions in I2C mode: In I2C mode, read access to the sector security status byte area is always allowed. Write access depends on the correct presentation of the I2C password (see Section 5.16.1: I2C present password command description). To access the Sector security status byte area, the device select code used for any I2C command must have the E2 Chip Enable address at 1. An I2C write access to a sector security status byte re-initializes the RF access condition to the given memory sector. 4.1.1 Example of the M24LR04E-R security protection in RF mode Table 11 and Table 12 show the sector security protections before and after a valid Present- sector password command. Table 11 shows the sector access rights of an M24LR04E-R after power-up. After a valid Present-sector password command with password 1, the memory sector access is changed as shown in Table 12. Table 11. M24LR04E-R sector security protection after power-up Sector address Sector security status byte b7b6b5 b4 b3 b2 b1 b0 0 Protection: standard Read No Write xxx 0000 1 1 Protection: pswd 1 Read No Write xxx 0100 1 2 Protection: pswd 1 Read Write xxx 0101 1 3 Protection: pswd 1 No Read No Write xxx 0110 1 4 Protection: pswd 1 No Read No Write xxx 0111 1 Table 12. M24LR04E-R sector security protection after a valid presentation of password 1 Sector address Sector security status byte b7b6b5 b4 b3 b2 b1 b0 0 Protection: standard Read No Write xxx 0 0 0 0 1 1 Protection: pswd 1 Read Write xxx 0 1 0 0 1 2 Protection: pswd 1 Read Write xxx 0 1 0 1 1 3 Protection: pswd 1 Read Write xxx 0 1 1 0 1 4 Protection: pswd 1 Read No Write xxx 0 1 1 1 1 |
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