Datasheet

NXP Semiconductors
MF0ICU2
MIFARE Ultralight C - Contactless ticket IC
MF0ICU2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2019. All rights reserved.
Product data sheet Rev. 3.3 — 30 July 2019
COMPANY PUBLIC 137633 21 / 36
Table 20 shows the required timing.
aaa-006286
CRCAddrPCD Cmd
PICC ,,ACK''
708 µs
PICC ,,NAK'' NAK
Time out
T
TimeOut
T
NAK
T
ACK
57 µs
ACK
57 µs
Data
Figure 12. WRITE
Table 19. WRITE command
Name Code Description Length
Cmd A2h write one page 1 byte
Addr - page address ‘02h’ to ‘2Fh’ 1 byte
CRC - CRC according to Ref. 2 2 bytes
Data - data 4 bytes
NAK see Table 15 see Section 8.3 4-bit
Table 20. WRITE timing
These times exclude the end of communication of the PCD.
T
ACK
min T
ACK
max T
NAK min
T
NAK max
T
TimeOut
WRITE n=9 T
TimeOut
n=9 T
TimeOut
10 ms
9.4 COMPATIBILITY WRITE
The COMPATIBILITY WRITE command was implemented to accommodate the
established MIFARE PCD infrastructure. Even though 16 bytes are transferred to the
MF0ICU2, only the least significant 4 bytes (bytes 0 to 3) will be written to the specified
address. It is recommended to set the remaining bytes 4 to 15 to all ‘0’.
Personalization of authentication key: For writing the authentication key, one needs to
write the key with four commands. The first command shall have the 4 least significant
bytes of the key and shall be written on page 2Ch, the second 4 bytes shall be written on
page 2Dh, the next 4 bytes shall be written on page 2Eh, the last 4 bytes shall be written
on page 2Fh.