NTAG213F/216F
NXP Semiconductors
NFC Forum T2T IC with 144/888 bytes user memory and field detection
8.6 NFC counter function
NTAG21xF features a NFC counter function. This function enables NTAG21xF to
automatically increase the 24 bit counter value, triggered by the first
• READ command or
• FAST-READ command
after the NTAG21xF tag is powered by an RF field.
The NFC counter is enabled or disabled with the NFC_CNT_EN bit (see Section 8.5.7).
The actual NFC counter value can be read with
• READ_CNT command or
• NFC counter mirror feature
The reading of the NFC counter (by both above listed ways or with the NFC counter
mirror) can also be protected with the password authentication. The NFC counter
password protection is enabled or disabled with the NFC_CNT_PWD_PROT bit (see
Section 8.5.7).
8.7 ASCII mirror function
NTAG21xF features a ASCII mirror function. This function enables NTAG21xF to virtually
mirror
• 7 byte UID (see Section 8.7.1) or
• 3 byte NFC counter value (see Section 8.7.2) or
• both, 7 byte UID and 3 byte NFC counter value with a separation byte (see
Section 8.7.3)
into the physical memory of the IC in ASCII code. On the READ or FAST READ command
to the involved user memory pages, NTAG21xF will respond with the virtual memory
content of the UID and/or NFC counter value in ASCII code.
The required length of the reserved physical memory for the mirror functions is specified
in Table 10.
Table 10. Required memory space for ASCII mirror
ASCII mirror
UID mirror
Required number of bytes in the physical memory
14 bytes
6 bytes
NFC counter
UID + NFC counter mirror 21 bytes
(14 bytes for UID + 1 byte separation + 6 bytes NFC counter value)
The position within the user memory where the mirroring of the UID and/or NFC counter
shall start is defined by the MIRROR_PAGE and MIRROR_BYTE values.
The MIRROR_PAGE value defines the page where the ASCII mirror shall start and the
MIRROR_BYTE value defines the starting byte within the defined page.
The ASCII mirror function is enabled with a MIRROR_PAGE value specified in the range
of Table 9.
NTAG213F_216F
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© NXP B.V. 2013. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.1 — 28 August 2013
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