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LRIS64K 数据表(PDF) 17 Page - STMicroelectronics |
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LRIS64K 数据表(HTML) 17 Page - STMicroelectronics |
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17 / 100 page  LRIS64K System memory area Doc ID 15336 Rev 11 17/100 Lock-sector Password command. The Sector Lock bit, b0, is set to ‘1’ automatically. After issuing a Lock-sector Password command, the protection settings of the selected sector are activated. The protection of a locked block cannot be changed. A Lock- sector Password command sent to a locked sector returns an error code. ● Present-sector Password The Present-sector Password command is used to present one of the three passwords to the LRIS64K in order to modify the access rights of all the memory sectors linked to that password (Table 5) 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. 3.2 Example of the LRIS64K security protection Table 8 and Table 9 show the sector security protections before and after a valid Present- sector Password command. Table 8 shows the sector access rights of an LRIS64K after power-up. After a valid Present-sector Password command with password 1, the memory sector access is changed as shown in Table 9. Table 8. 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 9. 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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