AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation
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AT88RF04C-MY1G Datasheet PDF : 158 Pages
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AT88SC0808/1616/3216/6416CRF, AT88RF04C
Table 78. Password Attempt Counter Coding for 88RF PICCs.
PAC Register
Description
$55
No Failed Attempts
$56
1 Failed Attempt
$59
2 Failed Attempts
$5A
3 Failed Attempts
$65
4 Failed Attempts
$66
5 Failed Attempts
$69
6 Failed Attempts
$6A
7 Failed Attempts
$95
8 Failed Attempts
$96
9 Failed Attempts
$99
10 Failed Attempts
$9A
11 Failed Attempts
$A5
12 Failed Attempts
$A6
13 Failed Attempts
$A9
14 Failed Attempts
$AA
15 Failed Attempts (LOCK)
All Other Values Are Not Supported
The Password Attempt Counters contain a value which indicates how many unsuccessful password verification
attempts have been made using the Password Index of the corresponding password. Table 76, Table 77, and Table 78
show coding of the PAC register. On 88SC PICCs the DCR register bit ETA selects the number of password attempt
that are permitted; the default configuration allows four attempts, ETA = 0b allows eight attempts. On 88RF PICCs the
maximum number of attempts is fifteen. If the PAC reaches the maximum count, then the corresponding password is
locked and all subsequent Check Password commands will fail.
I.4. Password Security Options
Password security for a User Zone is enabled by programming the Access Register for the zone. A Password Set is
assigned to the User Zone by programming the Password Register for the zone. Configuration of the registers is
described in Appendix H.
Table 79. Coding of the Password Mode bits of the Access Register.
PM1
PM0
Access
1
1
No Password Required
1
0
Write Password Required
0
1
Read and Write Passwords Required
0
0
Table 79 shows the available password security options. The default setting of PM=11b disables password security.
The remaining two options enable password security for either writes only, or for both reads and writes.
5276C–RFID–3/09
103
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