User manual

SCM3712 REFERENCE MANUAL 33
6.3.3.3. ATR for an NFC Forum tag type 1 user token (Topaz)
Byte# Value Designation Description
0 0x3B Initial header
1 0x82 T0 TD1 present. 2 historical bytes in following
ATR
2 0x80 TD1 Nibble8 indicates no TA2, TB2, TC2 and
TD2 present
Nibble0means T=0
3 0x01 TD2 Nibble8 indicates no TA3, TB3, TC3
Nibble1means T=1
4 0x02 Card Mode NFC TAG operating at Passive 106 baud
rate
5 0x44 Card Type Card type is Topaz
6 0xXX TCK XOR of all previous bytes
Example of the ATR built for a Topaz tag: