AT88SC1616C ATMEL [ATMEL Corporation], AT88SC1616C Datasheet - Page 8

• Manufacturer Part Number: AT88SC1616C
• Manufacturer: ATMEL [ATMEL Corporation]

Encryption
Supervisor Mode
Modify Forbidden
Program Only
8
AT88SC1616C
lates a MAC different from the MAC transmitted by the host, not only is the command
abandoned but the mode is also reset. A new authentication and/or encryption activation will
be required to reactivate the MAC.
The data exchanged between the device and the host during read, write and verify password
commands may be encrypted to ensure data confidentiality.
The issuer may choose to require encryption for a user zone by settings made in the configu-
ration zone. Any one of four keys may be selected for use with a user zone. In this case,
activation of the encryption mode is required in order to read/write data in the zone and only
encrypted data will be transmitted. Even if not required, the host may elect to activate encryp-
tion provided the proper keys are known.
Enabling this feature allows the holder of one specific password to gain full access to all 8
password sets including the ability to change passwords.
No write access is allowed in a user zone protected with this feature at any time. The user
zone must be written during device personalization prior to blowing the security fuses.
For a user zone protected by this feature, data within the zone may be changed from a “1” to a
“0”, but never from a “0” to a “1”.
2030AS–09/01