TagAccess is designed for applications requiring the functionality of a crypto
security transponder within a microcontroller based system.
TagAccess combines the functionality of a 125 kHz crypto transponder together
with an SPI serial interface. This unique combination allows for the sharing of
EEPROM and crypto operations between TagAccess and a microcontroller. It is
possible to access the EEPROM of TagAccess via a simple serial protocol or via the 125 kHz transponder link from the vehicle immobilizer base station.
EEPROM is used to store device configuration, the user programmable secret
keys (not readable via SPI), 32 bit unique Device Identification, 32 bit password,
as well as 3,726 bits of freely programmable user memory.
Different types of read/write protection of the EEPROM are also implemented.
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