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M24LR64-R 数据表(PDF) 24 Page - STMicroelectronics |
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M24LR64-R 数据表(HTML) 24 Page - STMicroelectronics |
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24 / 128 page  System memory area M24LR64-R 24/128 Doc ID 15170 Rev 14 The next 2 bits of the Sector security status byte (b3, b4) are the Password Control bits. The value these two bits is used to link a password to the sector as defined in Table 9. The M24LR64-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 password commands 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 Password: The Lock-sector Password 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 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 in RF mode. A Lock-sector Password command sent to a locked sector returns an error code. 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 the Password 1 10 The sector is protected by the Password 2 11 The sector is protected by the Password 3 Table 10. Password system area Block number 32-bit password number 1 Password 1 2 Password 2 3 Password 3 |
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