ACS AET62 NFC Reader with Fingerprint Sensor - Manual (Page 9)

4.1.2. ATR format for ISO 14443 Part 4 PICCs
Byte Value
(Hex)
Designation Description
0 3B Initial Header
1 8N T0 Higher nibble 8 means: no TA1, TB1, TC1
only TD1 is following.
Lower nibble N is the number of historical
bytes (HistByte 0 to HistByte N-1)
2 80 TD1 Higher nibble 8 means: no TA2, TB2, TC2
only TD2 is following.
Lower nibble 0 means T = 0
3 01 TD2 Higher nibble 0 means no TA3, TB3, TC3,
TD3 following.
Lower nibble 1 means T = 1
XX T1 4
to
3 + N
XX
XX
XX Tk
Historical Bytes:
ISO14443A:
The historical bytes from ATS response. Refer
to the ISO14443-4 specification.
ISO14443B:
The higher layer response from the ATTRIB
response (ATQB). Refer to the ISO14443-3
specification.
4+N UU TCK Exclusive-oring of all the bytes T0 to Tk
Table 3: ATR format for ISO 14443 Part 4 PICCs
We take for example, an ATR for DESFire which is:
DESFire (ATR) = 3B 86 80 01 06 75 77 81 02 80 00
ATR
ATS
Initial Header T0 TD1 TD2
T1 Tk TCK
3B 86 80 01 06 75 77 81 02 80 00
This ATR has 6 bytes of ATS which is: [06 75 77 81 02 80]
Note: Use the APDU “FF CA 01 00 00” to distinguish the ISO14443A-4 and ISO14443B-4
PICCs, and retrieve the full ATS if available. The ATS is returned for ISO14443A-3 or
ISO14443B-3/4 PICCs.
Another example would be the ATR for ST19XRC8E which is:
ST19XRC8E (ATR) = 3B 8C 80 01 50 12 23 45 56 12 53 54 4E 33 81 C3 55
ATR
ATQB
Initial Header T0 TD1 TD2
T1 Tk TCK
3B 86 80 01 50 12 23 45 56 12 53 54 4E 33 81 C3 55
Since this card follows ISO 14443 Type B, the response would be ATQB which is 50 12 23 45 56 12
53 54 4E 33 81 C3 is 12 bytes long with no CRC-B
Note: You can refer to the ISO7816, ISO14443 and PCSC standards for more details.
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