AT90SCR100 datasheet(179/433 Pages) ATMEL

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TPR0327AY–SMS–30Jan09

AT90SCR100

De-Activation

Deactivation by the Terminal as a result of : unresponsive ICC, or ICC removal.

ATR

Answer To Reset. Response from the ICC to a Reset initiated by the Terminal

F and D

F = Clock Rate Conversion Factor, D = Bit rate adjustment factor. ETU is defined as : ETU =

F/(D*f) with f = Card Clock frequency. If f is in Hertz, ETU is in second. F and D are available in

the ATR (byte TA1). The default values are F=372, D=1.

Guard Time

The time between 2 leading edges of the start bit of 2 consecutive characters is comprised of the

character duration (10) plus the guard time. Be aware that the Guard Time counter and the

Guard Time registers in the AT90SCR100 consider the time between 2 consecutive characters.

So the equation is Guard Time Counter = Guard Time + 10. In other words, the Guard Time is

the number of Stop Bits between 2 characters sent in the same direction.

Extra Guard Time

ISO IEC 7816-3 and EMV introduce the Extra Guard time to be added to the minimum Guard

Time. Extra Guard Time only apply to consecutive characters sent by the terminal to the ICC.

The TC1 byte in the ATR define the number N. For N=0 the character to character duration is 12

ETUs. For N=254 the character to character duration is 266. For N=255 (special case) The min-

imum character to character duration is to be used : 12 for T=0 protocol and 11 for T=1 protocol.

Block Guard Time

The time between the leading edges of 2 consecutive characters sent in opposit direction. ISO

IEC 7816-3 and EMV recommend a fixed Block Guard Time of 22 ETUs.

Work Waiting Time (WWT)

In T=0 protocol WWT is the interval between the leading edge of any character sent by the ICC,

and the leading edge of the previous character sent either by the ICC or the Terminal. If no char-

acter is received by the terminal after WWTmax time, the Terminal initiates a deactivation

sequence.

Character Waiting Time (CWT)

In T=1 protocol CWT is the interval between the leading edge of 2 consecutive characters sent

by the ICC. If the next character is not received by the Terminal after CWTmax time, the Termi-

nal initiates a deactivation sequence.

Block Waiting Time (BWT)

In T=1 protocol BWT is the interval between the leading edge of the start bit of the last character

sent by the Terminal that gives the right to sent to the ICC, and the leading edge of the start bit

of the first character sent by the ICC. If the first character from the ICC is not received by the

Terminal after BWTmax time, the Terminal initiates a deactivation sequence.

Waiting Time Extention (WTX)

In T=1 protocol the ICC can request a Waiting Time Extension with a S(WTX request) request.

The Terminal should acknowlege it. The Waiting time between the leading edge of the start bit of

AT90SCR100 Datasheet(PDF) 179 Page - ATMEL Corporation

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