How can I find Smart Card frequency ?

I have been developing an ATR parser class to parse ATR, calculate Bauds rate and and something like that, I have two question to ask:
- first is that I don't know where can I find frequency value to calculate Bauds Rare?
- second is that are we able to change any card bauds rate?

Sebastien,
The ATR specifies the "FI" and "DI" parameters which are mapped to respectively the supported clock rate conversion factor F (and maximum frequency fs) and the bitrate adjustment factor D, all of which are used to calculate the ETU and bitrate. Refer to ISO/IEC 7816-3 Section 8, specifically Table 7 and 8.
The clock frequency used by the reader must be supported by the card for a given protocol (T=0, T=1, etc).
EDIT:
This ties in with what you said about PPS exchange (a.k.a. protocol negotiation a.k.a. PTS request):
If the ATR indicates that protocol negotiation is allowed, the reader can send a PTS request to the card containing the reader's preferred choice of the FI and DI parameters for a transmission mode; the card's response will indicate whether those parameters can be used for subsequent communication. Alternatively, the reader can use the first protocol given in the ATR and default values for FI and DI.
This is just an overview - there are many more details regarding protocol negotiation; refer to ISO/IEC 7816 Sections 6.2.4, 6.3 and 9.
Note that protocol negotiation (PTS request) may take place at one time only: after the reader has received the ATR but before it sends any other traffic. Protocol negotiation does not follow the usual command-response APDU exchange format. For this reason the reader (or its driver) handles the negotiation transparently.
I hope that clarifies things...
Adriaan

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