AT88SC3216CRF-MVB1G Atmel, AT88SC3216CRF-MVB1G Datasheet - Page 104

• Manufacturer Part Number: AT88SC3216CRF-MVB1G
• Description: CRYPTOMEMORY 32KBIT 16ZONE MVB
• Manufacturer: Atmel
• Series: CryptoMemory®, CryptoRF®r

Specifications of AT88SC3216CRF-MVB1G

• Rf Type: Read / Write
• Frequency: 13.56MHz
• Features: ISO1444-2, 1444-3, 32-kbits
• Package / Case: MVB Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

I.5.
104
If PM = 10b, then the Write Password is required to be verified before a Write User Zone command will be accepted.
Data reads are not restricted in this configuration.
If read and write password security is enabled by setting PM = 01b or PM = 00b, then verification of the Read
Password allows access to data with the Read User Zone command; however no write access is permitted. Verification
of the Write Password allows access to the data with either Read User Zone or Write User Zone commands.
Password Verification
A password is sent for verification using the Check Password command as shown in Figure 31. The Password Index
identifies the Password Register that the password will be compared against. If the passwords match, then the PICC
will latch the verification status as PASS along with the Password Index in an internal register, write the PAC to show
no failed attempts, and return an ACK in the response.
The internal password security status register maintains its state until the PICC is reset or some other event causes
them to be changed. For example, sending another Check Password command will update these registers to reflect the
success or failure of the new password verification event. Note that only one password is active at any time, and only
the status of the most recent password verification event is stored in the PICC.
If multiple User Zones are assigned the same Password Set, then a single Check Password command will provide
access to all of these User Zones. Note that it does not matter if the Set User Zone command is sent before or after a
Check Password command. The currently selected User Zone is stored in a register that is independent of the
password security status register.
Figure 31.
If a Check Password command fails, then the PICC returns a NACK and a non-zero Status byte in the response. This
Status byte reports the reason for failure of the operation. See the Check Password Command [$cC], Section 6.19 of
this specification for a description of the Status codes.
AT88SC0808/1616/3216/6416CRF, AT88RF04C
Echo Command >
Command >
Check Password Command and Response
CID
Password Index
Reader
CRC1
CRC2
PW 1
PW 2
PW 3
$C
CID
ACK/NACK
STATUS
CRC1
CRC2
PICC
$C
5276C–RFID–3/09