Tuesday, March 14, 2017

ATR statistics: TC2 - Specific to T=0

Article from the series "ATR statistics"

TC2 - Specific to T=0

If present in the Answer-to-Reset, the interface byte TC2 encodes the waiting time integer WI over the eight bits, except the value '00' reserved for future use. If TC2 is absent, then the default value is WI = 10.

TC2#%
188991.17 %
0x0A472.27 %
0xFF200.97 %
0x10190.92 %
0x14180.87 %
0x0F140.68 %
0x96110.53 %
0x20100.48 %
0x8090.43 %
0x6050.24 %
0x1840.19 %
0x1E40.19 %
0x2A30.14 %
0x7830.14 %
0x0020.10 %
0x2320.10 %
0x3220.10 %
0x3E20.10 %
0xF020.10 %
0x0910.05 %
0x1C10.05 %
0x2810.05 %
0x6410.05 %
0xFA10.05 %
0xFE10.05 %



TC2 is only for T=0 cards.
It is surprising that 47 cards declare TC2=0x0A knowing that this is the default value.
It is also surprising that 2 cards (3B 95 15 40 00 68 01 02 00 00 and 3B A7 00 40 00 80 65 A2 08 00 00 00) are using the reserved value 0.