mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 89

• Manufacturer Part Number: mfrc531
• Description: Iso/iec 14443 Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
11.6.2.1 Relevant LoadKey command error flags
11.6.3 Authent1 command 0Ch
11.6.4 Authent2 command 14h
The LoadKey command interprets the first twelve bytes it finds in the FIFO buffer as the
key when stored in the correct key format as described in
page
checked and, if valid, are copied into the key buffer.
The LoadKey command can only be started by the microprocessor and it automatically
stops after copying the key from the FIFO buffer to the key buffer.
All bytes requested are copied from the FIFO buffer to the key buffer. If the key format is
not correct (see
into the key buffer and the KeyErr flag is set.
Table 147. Authent1 command 0Ch
The Authent1 command is a special Transceive command; it sends six argument bytes to
the card. The card’s response is not sent to the microprocessor, it is used instead to
authenticate the card to the MFRC531 and vice versa.
The Authent1 command can be triggered only by the microprocessor. The sequence of
states for this command are the same as those for the Transceive command; see
Section 11.2.3 on page
Table 148. Authent2 command 14h
The Authent2 command is a special Transceive command. It does not need any argument
byte, however all the data needed to be sent to the card is assembled by the MFRC531.
The card response is not sent to the microprocessor but is used to authenticate the card
to the MFRC531 and vice versa.
The Authent2 command can only be started by the microprocessor. The sequence of
states for this command are the same as those for the Transceive command; see
Section 11.2.3 on page
Command Value
Authent1
Command Value Action
Authent2
16. When the twelve argument bytes are available in the FIFO buffer they are
0Ch
14h
Section 9.2.3.1 “Key format” on page
Action
performs the first part of the Crypto1
card authentication
performs the second part of the card
authentication using the Crypto1 algorithm
Rev. 3.4 — 26 January 2010
82.
82.
056634
Arguments and data
card Authent1 command
card block address
card serial number LSB
card serial number byte1
card serial number byte2
card serial number MSB
16) an undefined value is copied
Section 9.2.3.1 “Key format” on
ISO/IEC 14443 reader IC
Arguments
and data
-
MFRC531
© NXP B.V. 2010. All rights reserved.
Returned
data
-
Returned
data
-
-
-
-
-
-
89 of 116