Document Version 1.0
Last revised on
2018-‐10-‐22
Page 22 of 79
Reference Manual for uTrust 5501 F Reader/Writer Module
5.3.3.2.
ATR for ISO/IEC 14443-‐4 User Tokens
The credential exposes its ATS or application information which is mapped to an ATR. The table
describes how this mapping is done.
Byte#
Value
Designation
Description
0
0x3B
Initial header
1
0x8n
T0
n indicates the number of historical bytes in following ATR
2
0x80
TD1
upper nibble 8 indicates no TA2, TB2, TC2
lower nibble 0 means T=0
3
0x01
TD2
upper nibble 0 indicates no TA3, TB3, TC3
lower nibble 1 means T=1
4...3+n
Historical
bytes
or
application
information
Type A: The historical bytes from the ATS (up to 15 bytes)
Type B (8 bytes):
●
Byte 0 through 3: application data from ATQB,
●
Byte 4 through 6: protocol info byte from ATQB,
●
Byte 7: highest nibble is the MBLI (maximum buffer length
index) from ATTRIB, lowest nibble is 0x0
4+n
TCK
XOR of all previous bytes
Example of the ATR built for an ISO 14443-‐4 credential:
Type A
Type B
