AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

K.7.

AAC Registers

The Authentication Attempt Counters contain a value which indicates how many unsuccessful Authentication and

Encryption Activation attempts have been made using the Key Index of the corresponding Secret Seed and Session

Encryption Key. Table 99, Table 100, and Table 101 show coding of the AAC register. If the AAC reaches the

maximum count of 4 or 8 on 88SC PICCs, then the corresponding key set is locked and all subsequent Authentication

attempts will fail. If the AAC reaches the maximum count of 15 on 88RF PICCs, then the corresponding key set is

locked and all subsequent Authentication attempts will fail.

If the AAC contents are corrupted, or are programmed with an undefined value, then the corresponding key set is

locked and all subsequent Authentication attempts will fail. The AAC registers can always be read using the Read

System Zone command.

Table 99. Authentication Attempt Counter Coding for the Default DCR Configuration on 88SC PICCs.

AAC Register

Description

$FF

No Failed Attempts

$EE

1 Failed Attempt

$CC

2 Failed Attempts

$88

3 Failed Attempts

$00

4 Failed Attempts (LOCK)

All Other Values Are Not Supported

Table 100. Authentication Attempt Counter Coding for the Extended Trials Allowed DCR Configuration on 88SC

PICCs.

AAC Register

Description

$FF

No Failed Attempts

$FE

1 Failed Attempt

$FC

2 Failed Attempts

$F8

3 Failed Attempts

$F0

4 Failed Attempts

$E0

5 Failed Attempts

$C0

6 Failed Attempts

$80

7 Failed Attempts

$00

8 Failed Attempts (LOCK)

All Other Values Are Not Supported

120 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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