User's Manual

ACR1281U
 Advanced Card Systems Ltd. Page 27 of 81
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:
Byte1-4 Byte5-7 Byte8
Application
Data from
ATQB
Protocol Info
Byte from
ATQB
Higher
nibble=MBLI
from
ATTRIB
command
Lower nibble
(RFU)=0
4+N UU TCK Exclusive-oring of all the bytes T0 to Tk
E.g 1. ATR for DESFire = { 3B 81 80 01 80 80 } // 6 bytes of ATR
Hint: Use the APDU “FF CA 01 00 00” to distinguish the ISO14443A-4 and ISO14443B-4 PICCs,
and retrieve the full ATS if available. ISO14443A-3 or ISO14443B-3/4 PICCs do have ATS
returned.
APDU Command = FF CA 01 00 00
APDU Response = 06 75 77 81 02 80 90 00
ATS = {06 75 77 81 02 80}
E.g 2. ATR for ez-link = { 3B 88 80 01 1C 2D 94 11 F7 71 85 00 BE}
Application Data of ATQB = 1C 2D 94 11
Protocol Information of ATQB = F7 71 85
MBLI of ATTRIB = 00