Reference Manual Preliminary
Prox–DU & Prox–SU
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DOC118569A Public Use Page 61/134
Di 0000 0001 0010 0011 0100 0101 0110 0111
D RFU 1 2 4 8 16 32 64
Di 1000 1001 1010 1011 1100 1101 1110 1111
D 12 20 RFU RFU RFU RFU RFU RFU
Table 20 -Bit rate adjustment factor D
TB1 and TB2
TB1 and TB2 are deprecated. The smart card should not transmit them. The interface
device shall ignore them.
Note: The first two editions of ISO 7816-3 specified TB1 and TB2 to fix electrical parameters
of the integrated circuit for the deprecated use of contact C6.
TC1
TC1 encodes the extra guard time integer (N) from 0 to 255 over the eight bits. The default
value is N = 0.
If N = 0 to 254, then before being ready to receive the next character, the smart card
requires the following delay from the leading edge of the previous character (transmitted by
the smart card or the interface device):
GT =12 etu + R × N/f
• If T=15 is absent in the Answer-to-Reset, then R = F / D, i.e., the integers used for
computing the etu.
• If T=15 is present in the Answer-to-Reset, then R = Fi / Di, i.e., the integers defined
above by TA1.
No extra guard time is used to transmit characters from the card: GT = 12 etu.
The use of N = 255 is protocol dependent: GT = 12 etu in PPS and in T=0. For the use of N
= 255 in T=1, refer to the ISO7816-3 standard.
TA2
TA2 is the specific mode byte. For the use of TA2 refer to the ISO7816-3 standard.
Bit 7 indicates the ability for changing the negotiable/specific mode:
• capable to change if bit 7 is set to 0,
• unable to change if bit 7 is set to 1.
Bits 6 and 5 are reserved for future use (set to 0 when not used).
Bit 4 indicates the definition of the parameters F and D.
• If bit 4 is set to 0, then the integers Fi and Di defined above by TA1 shall apply.
• If bit 4 is set to 1, then implicit values (not defined by the interface bytes) shall
apply.
Bits 3 to 0 encode a type T.
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