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M24LR64E-R 数据表(PDF) 25 Page - STMicroelectronics |
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M24LR64E-R 数据表(HTML) 25 Page - STMicroelectronics |
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25 / 140 page  M24LR64E-R System memory area Doc ID 022712 Rev 3 25/140 When the Sector Lock bit is set to 1, for instance by issuing a Lock-sector command, the two Read/Write protection bits (b1, b2) are used to set the Read/Write access of the sector as described in Table 8. The next two bits of the Sector security status byte (b3, b4) are the password control bits. The value of these two bits is used to link a password to the sector, as defined in Table 9. The M24LR64E-R password protection is organized around a dedicated set of commands, plus a system area of three password blocks where the password values are stored. This system area is described in Table 10. The dedicated commands for protection in RF mode are: ● Write-sector password: The Write-sector password command is used to write a 32-bit block into the password system area. This command must be used to update password values. After the write cycle, the new password value is automatically activated. It is possible to modify a password value after issuing a valid Present-sector password command. On delivery, the three default password values are set to 0000 0000h and are activated. ● Lock-sector: The Lock-sector command is used to set the sector security status byte of the selected sector. Bits b4 to b1 of the sector security status byte are affected by the Lock-sector Table 8. Read/Write protection bit setting Sector Lock b2, b1 Sector access when password presented Sector access when password not presented 0 xx Read Write Read Write 1 00 Read Write Read No Write 1 01 Read Write Read Write 1 10 Read Write No Read No Write 1 11 Read No Write No Read No Write Table 9. Password control bits b4, b3 Password 00 The sector is not protected by a password. 01 The sector is protected by password 1. 10 The sector is protected by password 2. 11 The sector is protected by password 3. Table 10. Password system area Add 1 Password 1 2 Password 2 3 Password 3 |
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