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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS39513 датащи(PDF) 14 Page - ams AG |
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AS39513 датащи(HTML) 14 Page - ams AG |
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14 / 108 page  Page 14 ams Datasheet Document Feedback [v1-10] 2018-Apr-25 AS39513 − Detailed Description Data Protection The 9-kbit EEPROM is accessed through a controller that manages the overall chip operation. Every address in the memory map is assigned to one of four types of access levels. There is write protection for three memory areas (System, Application, and Measurement) using three different 32-bit passwords. All three memory areas are open for read at all times. A fourth memory area, called the Factory area, is much more restricted and is not accessible via RF except for the lock bits and passwords. This is used for passwords, memory lock bits, and some calibration information. For the Application, Measurement and System Access areas the access via RF remains open until the RF field is removed (the access via RF will close with the loss of RF field even if the logic is continuously powered by an external battery). Note if the chip is powered by a battery these areas will still be accessible by SPI. The chip also supports a one-time use secure mode. When this mode is used, the RFID write capability for all Application and Measurement blocks is blocked. The measurement area can still be written through the logging operations, but the logging results cannot be overwritten through the RFID interface even if the 32-bit password is known. |
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