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M24LR04E-R 数据表(PDF) 23 Page - STMicroelectronics |
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M24LR04E-R 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 142 page  M24LR04E-R System memory area Doc ID 022208 Rev 5 23/142 4 System memory area 4.1 M24LR04E-R block security in RF mode The M24LR04E-R provides a special protection mechanism based on passwords. In RF mode, each memory sector of the M24LR04E-R can be individually protected by one out of three available passwords, and each sector can also have Read/Write access conditions set. Each memory sector of the M24LR04E-R is assigned with a Sector security status byte including a Sector Lock bit, two Password Control bits and two Read/Write protection bits, as shown in Table 7. Table 6 describes the organization of the Sector security status byte, which can be read using the Read Single Block and Read Multiple Block commands with the Option_flag set to 1. On delivery, the default value of the SSS bytes is set to 00h. 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. Table 6. Sector security status byte area I2C byte address Bits [31:24] Bits [23:16] Bits [15:8] Bits [7:0] E2 = 1 0 SSS 3 SSS 2 SSS 1 SSS 0 Table 7. Sector security status byte organization b7 b6 b5 b4 b3 b2 b1 b0 0 0 0 Password control bits Read / Write protection bits Sector Lock 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 |
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