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M24LR16E-R 数据表(PDF) 24 Page - STMicroelectronics |
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M24LR16E-R 数据表(HTML) 24 Page - STMicroelectronics |
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24 / 143 page  System memory area M24LR16E-R 24/143 Doc ID 018932 Rev 8 4 System memory area 4.1 M24LR16E-R block security in RF mode The M24LR16E-R provides a special protection mechanism based on passwords. In RF mode, each memory sector of the M24LR16E-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 M24LR16E-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. 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 E2 = 1 4 SSS 7 SSS 6 SSS 5 SSS 4 E2 = 1 8 SSS 11 SSS 10 SSS 9 SSS 8 E2 = 1 12 SSS 15 SSS 14 SSS 13 SSS 12 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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