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NTP53X2 Datasheet(PDF) 23 Page - NXP Semiconductors |
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NTP53X2 Datasheet(HTML) 23 Page - NXP Semiconductors |
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23 / 133 page  NXP Semiconductors NTP53x2 NTAG 5 link - NFC Forum-compliant I2C bridge NTP53x2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. Product data sheet Rev. 3.3 — 3 July 2020 COMPANY PUBLIC 544533 23 / 133 Value Status Description C7h Access right activated &privileges locked The status is the same as for C1h with the exception that the Key Privileges are locked and cannot longer be modified. The settings for the EAS/AFI protection are enabled. Access with the related commands to EAS and AFI is only possible according to the EAS/AFI protection conditions. E7h Activated The settings of the NFC Protection Pointer and the NFC Protection Pointer Condition are enabled. Read and write access protection is enabled according to the initialized values. All Key Header Privileges and Keys are locked cannot be modified The settings for the EAS/AFI protection are enabled. Access with the related commands to EAS and AFI is only possible according to the EAS/AFI protection conditions. all others Invalid 8.1.3.5 NFC Crypto Configuration Header The value of the NFC Crypto Configuration Header (NFC_CCH) locks the NFC Authentication Limit to the defined value and can only be changed after authentication. NFC_CCH can be written by using the WRITE CONFIGURATION command (see Section 8.2.3.2.2). From I2C perspective, NFC_CCH can be accessed with READ and WRITE command, as long as not locked by the I2C section lock. Table 19. Crypto Configuration Header (CCH) location Block Address NFC I2C Byte 0 Byte 1 Byte 2 Byte 3 0Dh 100Dh RFU NFC_CCH RFU Table 20. Crypto Configuration Header Values Value Mode Write Access 81h Unlocked (default) Authentication limit can be modified. E7h Locked Authentication limit is locked and can only be modified after mutual authentication with a key with activated crypto configuration privilege or authenticating with the write password. In 64-bit password mode both, the read and write password are required, depending on the used security level. All others Invalid 8.1.3.6 NFC Authentication Limit Counter The NFC Authentication Limit Counter is a feature to limit the number of authentications. When enabled, the counter is incremented for every CHALLENGE (see Section 8.2.3.4.5) or AUTHENTICATION (see Section 8.6.4) command. Both, positive and negative attempts get counted. On default. the counter is not enabled (NFC_AUTH_LIMIT = 0000h). |
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