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ST25DV64K 数据表(PDF) 57 Page - STMicroelectronics |
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ST25DV64K 数据表(HTML) 57 Page - STMicroelectronics |
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57 / 200 page  Figure 22. RF security sessions management RF field OFF RF field ON ST25DV out of RF field All RF security sessions closed RF security session x opened (y closed) Any other command Present RF_PWD_x OK RF security session y opened (x closed) Present RF_PWD_y OK Present RF_PWD_x OK Present any RF password not OK(1) Any other command Any other command 1. Presenting a password with an invalid password number doesn't close the session. The dedicated password commands in I2C mode are: • I2C Write Password command: see Section 6.6.2 I2C write password command description. • I2C Present Password command: see Section 6.6.1 I2C present password command description. I2C host possible actions for security sessions are: • Open I 2 C security session: I2C Present Password command with valid I2C password. • Write I 2 C password: I2C Present Password command with valid I2C password. Then I2C Write Password command with new I2C password. • Close I 2 C security session: I2C Present Password command with wrong I2C password. Or remove tag VCC power supply (POR). • Check if I 2 C security session is open: I2C host can read the current status (open or closed) of I2C security session by reading the I2C_SSO_Dyn register. There is no interaction between I2C and RF security sessions. Both are independent and can run in parallel. ST25DV04K ST25DV16K ST25DV64K Data Protection DS10925 - Rev 9 page 57/200 |
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