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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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ST25DV04K bảng dữ liệu(PDF) 58 Page - STMicroelectronics |
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ST25DV04K bảng dữ liệu(HTML) 58 Page - STMicroelectronics |
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58 / 200 page  Figure 23. I2C security sessions management VCC OFF VCC ON VCC OFF I2C security session closed I2C_SSO=00h I2C security session opened I2C_SSO=01h Present I2C_PWD not OK Any other command Present I2C_PWD OK Any other command 5.6.3 User memory protection On factory delivery, areas are not protected. Each area can be individually protected in read and/or write access from RF and I2C. Area 1 is always readable (from RF and I2C). Furthermore, RF blocks 0 and 1 (I2C bytes 0000h to 0007h) can be independently write locked. User memory protection from RF access In RF mode, each memory area of the ST25DVxxx can be individually protected by one out of three available passwords (RF password 1, 2 or 3), and each area can also have individual Read/Write access conditions. For each area, an RFAiSS register is used to: • Select the RF password that unlock the RF user security session for this area • Select the protection against read and write operations for this area (See Table 44. RFA1SS, Table 46. RFA2SS, Table 48. RFA3SS, and Table 50. RFA4SS for details about available read and write protections). Note: Setting 00b in PWD_CTRL_Ai field means that RF user security session cannot be open by any password for the corresponding area. When updating RFAiSS registers, the new protection value is effective immediately after the register write completion. ST25DV04K ST25DV16K ST25DV64K Data Protection DS10925 - Rev 9 page 58/200 |
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