mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 88

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

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
11.6.1.1 Relevant LoadKeyE2 command error flags
11.6.1 LoadKeyE2 command 0Bh
11.6.2 LoadKey command 19h
11.5 Error handling during command execution
11.6 MIFARE security commands
If an error is detected during command execution, the PrimaryStatus register Err flag is
set. The microprocessor can evaluate the status flags in the ErrorFlag register to get
information about the cause of the error.
Table 144. ErrorFlag register error flags overview
Table 145. LoadKeyE2 command 0Bh
The LoadKeyE2 command interprets the first two bytes found in the FIFO buffer as the
EEPROM starting byte address. The EEPROM bytes starting from the given starting byte
address are interpreted as the key when stored in the correct key format as described in
Section 9.2.3.1 “Key format” on page
FIFO buffer, the command executes.
The LoadKeyE2 command can only be started by the microprocessor and it automatically
stops after copying the key from the EEPROM to the key buffer.
If the key format is incorrect (see
value is copied into the key buffer and the KeyErr flag is set.
Table 146. LoadKey command 19h
Error flag
KeyErr
AccessErr
FIFOOvlf
CRCErr
FramingErr
ParityErr
CollErr
Command
LoadKeyE2
Command Value
LoadKey
19h
Value
0Bh
Action
reads a key from the FIFO buffer and puts it
into the key buffer
Rev. 3.4 — 26 January 2010
Action
reads a key from the EEPROM and
puts it into the internal key buffer
056634
Section 9.2.3.1 “Key format” on page
16. When both argument bytes are available in the
Related commands
LoadKeyE2, LoadKey
WriteE2, ReadE2, LoadConfig
no specific commands
Receive, Transceive, CalcCRC
Receive, Transceive
Receive, Transceive
Receive, Transceive
Arguments and
data
start address LSB
start address MSB
Arguments and
data
byte 0 (LSB)
byte 1
…
byte 10
byte 11 (MSB)
ISO/IEC 14443 reader IC
MFRC531
© NXP B.V. 2010. All rights reserved.
16) an undefined
Returned
data
-
-
Returned
data
-
-
-
-
-
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