SmartCard ISO 7816 - AFNOR

It appears that you are using AdBlocking software. The cost of running this website is covered by advertisements. If you like it please feel free to a small amount of money to secure the future of this website.
      -------------+------------- 
     |   1         |         5   | 
     |             |             | 
     +-------\     |     /-------+ 
     |   2    +----+    +    6   | 
     |        |         |        | 
     +--------|         |--------+ 
     |   3    |         |    7   | 
     |        +----+----+        | 
     +-------/     |     \-------+ 
     |   4         |         8   | 
     |             |             | 
      -------------+------------- 

CONNECTOR at the card

Pin Name Description
1 VCC +5 VDC
2 RESET Reset
3 CLOCK Clock
4 n/c Not connected
5 GND Ground
6 n/c Not connected
7 I/O In/Out
8 n/c Not connected
     =============================================================================== 
                     ISO7816 asynchronous smartcard information 
     =============================================================================== 
                             (C) Stephane BAUSSON - (95) 
                        Version 1.00 (Last revised: 12-06-1995) 
                                  4, Rue de Grand 
                                 F-88630 Chermisey 
                                      France 
     ------------------------------------------------------------------------------- 
     >>> Any suggestions or comments about phonecards and smartcards are welcome <<< 
     ------------------------------------------------------------------------------- 
     This file is archived at nic.funet.fi:/pub/doc/telecom/phonecard/chips 
     Document History: 
     ~~~~~~~~~~~~~~~~ 
         Version 1.00 : First version of the document. 
     Glossary of terms: 
     ~~~~~~~~~~~~~~~~~~ 
         TBC : to be confirmed 
         TBD : to be defined 
     ------------------------------------------------------------------------------- 
                                    * Content * 
                                    ~~~~~~~~~~~ 
      I ) Introduction of the ISO7816 standard 
     II ) Summury of the ISO7816 standard 
         2.1 - ISO7816-1 Standard 
            2.2.1) Minimal Contact Size 
            2.2.2) Pin's position 
         2.2 - ISO7816-2 Standard 
            2.2.3) Pin Assignement 
            2.2.4) Contact Location 
         2.3 - ISO7816-3 Standard 
            2.3.1) Electrical Signals Description: 
            2.3.2) Voltage and current values: 
            2.3.3) Operating procedure for integrated circuit(s) cards: 
            2.3.4) Answer to Reset: 
     ------------------------------------------------------------------------------- 
      I ) Introduction of the ISO7816 standard: 
          ==================================== 
     II ) Summary of the ISO7816 standard: 
          =============================== 
         The ISO7816 standard are separated in 3 different parts 
          - ISO7816-1 which define the physical characteristics of the card. 
          - ISO7816-2 which define dimension and contact position of the card. 
          - ISO7816-3 which define the electical signals and transmission protocols. 
          The following organisations should be contacted for more details: 
            - CEN (Comit‚ Eurp‚en de Normalisation) 
                rue Br‚derote 2 
                B-1000 Brussels 
                Belgium 
            - ISO (International Standard Institute) 
                Case postale 56 
                CH-1211 GenŠve 20 
                Switzerland 
         2.1 - ISO7816-1 Standard 
               ~~~~~~~~~~~~~~~~~~ 
          The ISO7816 Standard define many physical features, but here we are only 
          going to describe the more intesting features. 
        * Ultra violet light : 
          Any protection beyond the ambiant UV light level shall be to the 
          responsability of the card manufacturer. 
        * X-rays : 
          Exposure of either side of the card to a dose of 0.1 Gy relative to a 
          medium-energy X radiation of 70 to 140 Kv (cumulative dose per year) 
          shall not cause malfunction of the card. 
        * Surface profile of the contacts : 
          The difference in level between all contacts and the adjacent card 
          surface shall be less than 0.1 mm. 
        * Mecanical strenght (of the card and contact) 
          The card shall resist damage to its surface and any components contained 
          in it and shall remain intact during normal use, storage and handling. 
          surface (with pins) must not be damaged by a pression caused by a steel 
          ball of 1.5 mm diameter on which is applied a strenght of 1.5 N. 
        * Electrical resistance : All the resistances measured between any two 
          points of the pins must not be over 0.5 Ohm, with any current value 
          from 50 uA to 300 mA. 
        * Magnetic field : The chip of the card must not be damaged by a static 
          magnetic field of 79500 A.tr/m 
        * Static electricity : The card must not be damaged by a electrical 
          discharge of 1500 V of a 100 pF capacitor trought a 1500 Ohm resistance. 
        * card maximal bending : 
                              __________ 
                      ___,---'          '---,___         ^ 
                 _,--'                          '--,_    |  f 
               ,'                                    ',  v 
          a - large side of the card 
                - deformation (f) : 2 cm 
                - periodicity : 30 bendings a minute 
          b - short side of the card 
                - deformation (f) : 1 cm 
                - periodicity : 30 bendings a minute 
          Acceptance: The card must work correctly and must not have any crackings 
          after 1000 bendings. 
         2.2 - ISO7816-2 Standard 
               ~~~~~~~~~~~~~~~~~~ 
        2.2.1) Minimal Contact Size : 
             ,-------------,  ^ 
             |             |  | 
             |             |  | 1.7mm 
             |             |  | 
             '-------------'  v 
             :<----------->: 
                  2mm 
        2.2.2) Pin's position : 
           ,----------------------------------------------------------------- 
           |      :  : 
           |      :  C 
           |      D  : 
           |      :  ---- ,----,            ,----, 
           |      :       | C8 |            | C4 | -, 
           |      ------- '----'            '----'  | 
           |              ,----,            ,----,  | 
           |              | C7 |            | C3 |  | 
           |              '----'            '----'  | 
           |              ,----,            ,----,  |  AFNOR position 
           |              | C6 |            | C2 |  | 
           |              '----'            '----'  | 
           |              ,----,            ,----,  | 
           |              | C5 |            | C1 | -' 
           |              '----'            '----' 
           |              ,----,            ,----, 
           |              | C1 |            | C5 | -, 
           |              '----'            '----'  | 
           |              ,----,            ,----,  | 
           |              | C2 |            | C6 |  | 
           |              '----'            '----'  |  ISO7816 position 
           |              ,----,            ,----,  | 
           |              | C3 |            | C7 |  | 
           |              '----'            '----'  | 
           |              ,----,            ,----,  | 
           |              | C4 |            | C8 | -' 
           |              '----'            '----' 
           |                                :    : 
           |              A                 :    : 
           |<------------------------------>:    : 
           |                                     : 
           |                  B                  : 
           |<----------------------------------->: 
           | 
        2.2.3) Pin Assignement:    C1 : Vcc = 5V        C5 : Gnd 
               ---------------     C2 : Reset           C6 : Vpp 
                                   C3 : Clock           C7 : I/O 
                                   C4 : RFU             C8 : RFU 
        2.2.4) Contact Location: 
               ----------------- 
        All the sizes are in milimeters 
            |   A       B       C       D           |   A       B       C       D 
        ----+-------------------------------    ----+------------------------------- 
         C1 | 10.25   12.25   19.23   20.93      C1 | 17.87   19.87   16.69   18.39 
         C2 | 10.25   12.25   21.77   23.47      C2 | 17.87   19.87   14.15   15.85 
         C3 | 10.25   12.25   24.31   26.01      C3 | 17.87   19.87   11.61   13.31 
         C4 | 10.25   12.25   26.85   28.55      C4 | 17.87   19.87    9.07   10.77 
         C5 | 17.87   19.87   19.23   20.93      C5 | 10.25   12.25   16.69   18.39 
         C6 | 17.87   19.87   21.77   23.47      C6 | 10.25   12.25   14.15   15.85 
         C7 | 17.87   19.87   24.31   26.01      C7 | 10.25   12.25   11.61   13.31 
         C8 | 17.87   19.87   28.85   28.55      C8 | 10.25   12.25    9.07   10.77 
        ----+-------------------------------    ----+------------------------------- 
                   ISO7816 location                          AFNOR location 
        NB: The AFNOR location is transitional, and has been used for compatibility 
            reasons with existing magnetic stripe cards. 
         2.3 - ISO7816-3 Standard 
               ~~~~~~~~~~~~~~~~~~ 
        2.3.1) Electrical Signals Description: 
               ------------------------------ 
        I/O : Input or Output for serial data to the integrated circuit inside 
              the card. 
        VPP :  Programing voltage input (optional use by the card). 
        GND : Ground (reference voltage). 
        CLK : Clocking or timing signal (optional use by the card). 
        RST : Either used itself (reset signal supplied from the interface device) 
              or in combination with an interal reset control circuit (optional use 
              by the card). If internal reset is implemented, the voltage supply on 
              Vcc is mandatory. 
        VCC : Power supply input (optional use by the card). 
        NOTE - The use of the two remaining contacts will be defined in the 
               appropriate application standards. 
        2.3.2) Voltage and current values: 
               -------------------------- 
        Abbreviations: 
          Vih : High level input voltage 
          Vil : Low level input voltage 
          Vcc : Power supply voltage at VCC 
          Vpp : Programming voltage  at VPP 
          Voh : High level output voltage 
          Vol : Low level output voltage 
          tr  : Rise time between 10% and 90% of signal amplitude 
          tf  : Fall time between 90% and 10% of signal amplitude 
          Iih : High level input current 
          Iil : Low level input current 
          Icc : Supply current at VCC 
          Ipp : Programming current at VPP 
          Ioh : High level output current 
          Iol : Low level output current 
          Cin : Input capacitance 
          Cout: Output capacitance 
        * I/O 
          This contact is used as input (reception mode) or output (transmission 
          mode) for data exchange. Two possible states exist for I/O: 
          - mark or high state (State Z), if the card and the interface device are 
            in reception mode or if the state is imposed by the transmitter. 
          - space or low state (State A), if this state is imposed by the 
            transmitter. 
          When the two ends of the line are in reception mode, the line shall be 
          maintained in state Z. When the two ends are in non-matced transmit mode, 
          the logic state of the line may be indeterminate. During operations, the 
          interface device and the card shall not both be in transmit mode. 
             Table 1 - Electrical characteristics of I/O under normal 
                       operation conditions. 
          ,--------+--------------------------------+---------+---------+------, 
          | Symbol |          Conditions            | Minimum | Maximum | Unit | 
          +--------+--------+-----------------------+---------+---------+------+ 
          |        | Either | Iih max = +/- 500uA   |    2    |    VCC  |   V  | 
          |  Vih   |   (1)  +-----------------------+---------+---------+------+ 
          |        |   or   | Iih max = +/- 50uA    | 0.7 VCC | VCC (3) |   V  | 
          +--------+--------+-----------------------+---------+---------+------+ 
          |  Vil   |          Iil max = 1mA         |    0    |    0.8  |   V  | 
          +--------+--------------------------------+---------+---------+------+ 
          |        | Either | Iol max = +/- 100uA   |   2.4   |    VCC  |   V  | 
          |  Voh   |        +-----------------------+---------+---------+------+ 
          |    (2) |   or   | Iol max = +/- 20uA    |   3.8   |    VCC  |   V  | 
          +--------+--------+-----------------------+---------+---------+------+ 
          |  Vol   |          Iol max = 1mA         |    0    |    0.4  |   V  | 
          +--------+--------------------------------+---------+---------+------+ 
          | tr, tf | Cin = 30pF;   Cout = 30pF      |         |      1  |   us | 
          +--------+--------------------------------+---------+---------+------+ 
          | (1) For the interface device, take into account both conditions.   | 
          | (2) It is assumed that a pull up resistor is used in the interface | 
          |     device (recommended value 20k Ohm.                             | 
          | (3) The voltage on I/O shall remain between 0.3V and VCC+0.3V.     | 
          '--------------------------------------------------------------------' 
        * VPP 
          This contact may be to supply the voltage required to program or to erase 
          the internal non-volatile memory. Two possible states exists for VPP: 
          Idle state and active state, as defined in table 2. The idle state shall 
          be maintained by the interface device unless the active state is required. 
             Table 2 : Electrical characteristics of VPP under normal 
                       operation conditions. 
          ,--------+--------------------------------+---------+---------+------, 
          | Symbol |          Conditions            | Minimum | Maximum | Unit | 
          +--------+--------------------------------+---------+---------+------+ 
          |  Vpp   |         Idle State             | 0.95*Vcc| 1.05*Vcc|   V  | 
          |  Ipp   |   (programming non active)     |         |   20    |  mA  | 
          +--------+--------------------------------+---------+---------+------+ 
          |  Vpp   |        Active State            | 0.975*P | 1.025*P |   V  | 
          |  Ipp   |    (programming the card)      |         |     I   |  mA  | 
          +--------+--------------------------------+---------+---------+------+ 
          | The card provides the interface with the values of P and I         | 
          | (default values: P=5 and I=50)                                     | 
          '--------------------------------------------------------------------' 
          Rise of fall time : 200 us maximum. The rate of change of Vpp shall not 
          exceed 2V/us. 
          The maximum power Vpp*Ipp shall not exceed 1.5W when averaged over any 
          period of 1s. 
        * CLK 
          The actual frequency, delivered by the interface device on CLK, is 
          designated either by fi the initial frequency during the answer to reset, 
          or by fs the subsequent frequency during subsequent transmission. 
          Duty cycle for asynchronous operations shall be between 45% and 55% of the 
          period during stable operation. Care shall be taken when switching 
          frequencies (from fi to fs) to ensure that no pulse is shorter than 45% of 
          the shorter period. 
             Table 3 - Electrical characteristics of CLK under normal 
                       operation conditions. 
          ,--------+--------------------------------+---------+---------+------, 
          | Symbol |          Conditions            | Minimum | Maximum | Unit | 
          +--------+--------+-----------------------+---------+---------+------+ 
          |        | Either | Iih max = +/- 200uA   |   2.4   | VCC (2) |   V  | 
          |        |   (1)  +-----------------------+---------+---------+------+ 
          |  Vih   |   or   | Iih max = +/- 20uA    | 0.7*VCC | VCC (2) |   V  | 
          |        |   (1)  +-----------------------+---------+---------+------+ 
          |        |   or   | Iih max = +/- 10uA    | VCC-0.7 | VCC (2) |   V  | 
          +--------+--------+-----------------------+---------+---------+------+ 
          |  Vil   |          Iil max = +/-200 uA   |   0 (2) |    0.5  |   V  | 
          +--------+--------------------------------+---------+---------+------+ 
          | tr, tf |          Cin = 30pF            |         |9% of the period| 
          |        |                                |         |with a max:0.5us| 
          +--------+--------------------------------+---------+---------+------+ 
          | (1) For the interface device, take into account three conditions.  | 
          | (2) The voltage on CLK shall remain between 0.3V and Vcc+0.3V.     | 
          '--------------------------------------------------------------------' 
        * RST 
             Table 4 - Electrical characteristics of RST under normal 
                       operation conditions. 
          ,--------+--------------------------------+---------+---------+------, 
          | Symbol |          Conditions            | Minimum | Maximum | Unit | 
          +--------+--------+-----------------------+---------+---------+------+ 
          |        | Either | Iih max = +/- 200uA   |    4    | VCC (2) |   V  | 
          |  Vih   |   (1)  +-----------------------+---------+---------+------+ 
          |        |   or   | Iih max = +/- 10uA    | VCC-0.7 | VCC (2) |   V  | 
          +--------+--------+-----------------------+---------+---------+------+ 
          |  Vil   |          Iil max = +/- 200uA   |   0 (2) |    0.6  |   V  | 
          +--------+--------------------------------+---------+---------+------+ 
          | (1) For the interface device, take into account both conditions.   | 
          | (2) The voltage on RST shall remain between 0.3V and VCC+0.3V.     | 
          '--------------------------------------------------------------------' 
        * VCC 
          This contact is used to supply the power voltage Vcc. 
             Table 5 - Electrical characteristics of VCC under normal 
                       operation conditions. 
                   ,--------+---------+---------+-------, 
                   | Symbol | Minimum | Maximum |  Unit | 
                   +--------+---------+---------+-------+ 
                   |  Vcc   |   4.75  |   5.25  |   V   | 
                   |  Icc   |         |    200  |  mA   | 
                   '--------+---------+---------+-------' 
        2.3.3) Operating procedure for integrated circuit(s) cards: 
               --------------------------------------------------- 
        This operating procedure applies to every integrated circuit(s) card with 
        contacts: 
        The dialogue between the interface device and the the card shall be 
        conducted through the consecutive operations: 
           - connection and activation of the contacts by the interface device. 
           - reset of the card. 
           - answer to reset by the card. 
           - subsequent information exchange between the card and the interface 
             device. 
           - desactivation of the contacts by the interface device. 
        These operations are specified in the following subclauses. 
        NOTE : An active state on VPP should not only be provided and maintained 
               when requested by the card. 
        a - Connection and activation of the contacts: 
            ----------------------------------------- 
        The electrical circuits shall not be activated until the contacts are 
        connected to the interface device so as to avoid possible damage to any 
        card meeting these standards. 
        The activation of the contacts by the interface device shall consist of the 
        consecutive operations: 
            - RST is in state L; 
            - VCC shall be powered; 
            - I/O in the interface device shall be put in reception mode; 
            - VPP shall be raised to idle state; 
            - CLK shallbe provided with a suitable and stable clock. 
        b - Reset of the card: 
            ----------------- 
        A card reset is initiated by the interface device, whereupon the card shall 
        respond with an Answer to Reset as describe in 2.4. 
        By the end of the activation of the contacts (RST is in L, VCC powered and 
        stable, I/O in reception mode in the interface device, VPP stable at idle 
        level, CLK provided with a suitable and stable clock), the card answering 
        asynchronously is ready for reset. 
        The clock signal is applied to CLK at time T0. The I/O line shall be set to 
        state Z within 200 clcok cycles of the clock signal (t2) being applied to 
        CLK (time t2 after T0). 
        An internally reset card reset after a few cycles of clock signal. The 
        Answer to Reset on I/O shall begin between 400 and 40 000 clock cycles (t1) 
        after the clock signal is applied to CLK (time t1 after T0). 
        A card with an active low reset is reset by maintaining RST in state L for 
        at least 40 000 clock cycles (t3) after the clock signal is applied on CLK 
        (time t3 after T0). Thus if no Answer to Reset begind within 40 000 clock 
        cycles (t3) with RST in state L, RST is put to state H (at time T1). The 
        Answer to Reset on I/O shall begin between 400 and 40 000 clock cycles (t1) 
        after the rising edge of the signal on RST (time t1 after T1). 
        If the Anwser to Reset does not begin within 40 000 clock cycles (t3) with 
        RST in state H (t3 after T1), the signal on RST shall be returned to state 
        L (at time T2) and the contacts shall be desactivated by the interface 
        device. 
     GND __________________________________________________________________________ 
             __________________________________________________________________ 
     VCC ___| :                                                               :|___ 
              :_______________________________________________________________: 
     VPP ____|:                                                               |____ 
              :             t3                            t3                  : 
              :<--------------------------->:<------------------------------->: 
              :                             :_________________________________: 
     RST _____:_____________________________|                                 |____ 
              :                             :                                 : 
     CLK _____|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||____ 
              :       t1                    :                                 : 
              :<-------------->:            :                                 : 
              :      __________:____________:_________________________________: 
     I/O ____XXXXXXXX          |____________:_______Answer____________________:XXXX 
     (IR)     :      :                      :                                 : 
              :  t2  :                      :      t1                         : 
              :<---->:                      :<---------->:                    : 
              :      _______________________:_________________________________: 
     I/O ____XXXXXXXX                       :            |______Answer________:XXXX 
     (AL)     :  t2  :                      :                                 : 
              :<---->:                      :                                 : 
              :                             :_________________________________: 
     I/O ____XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:                                 :XXXXX 
     (SH)     :                             :                                 : 
              T0                            T1                                T2 
         IR : Internal Reset                t2 <= 200/fi 
         AL : Asynchronous Reset            400/fi <= t1 <= 40000/fi 
         SH : Syncronous Reset              40000/fi <= t3 
                           Figure1 : Reset of the card 
                           ~~~~~~~ 
        With a card answering synchonously, the interface device sets all the lines 
        to state L (See figure 2). VCC is the powered, VPP is set to idle state, CLK 
        and RST remain in L state, I/O is put in reception mode in the interface 
        device, RST shall be maintained in state H for at least 50 us (t12), before 
        returning to state L again. 
        The clock pulse is applied after an interval (t10) from the rising edge of 
        the reset signal. The duration of the state H of the clock pulse can be any 
        value between 10 us and 50 us ; no more than one clock pulse during reset 
        high is allowed. The time interval between the falling edges on CLK and RST 
        is t11. 
        The first data bit is obtained as an answer to reset on I/O while CLK is in 
        state L and is valid after an interval t13 from the falling edge on RST. 
             ______________________________________________________________________ 
     VCC ___/ 
              _____________________________________________________________________ 
     VPP ____/ 
                        t12 
                :<---------------->: 
                :__________________: 
     RST ______/:                   _______________________________________________ 
                :                    : 
                :  t10           t11 :          t15      t16 
                :<---->:      :<---->:  t14   :<---->: :<---->: 
                       : ____ :      :<---->: :______: :      : _______ 
     CLK_______________:/  1 \:______:______:/   2    \:______:/   3   _______ 
                                     :                 : 
                                     : t13             :  t17 
                                     :<---->:          :<---->: 
              _____________________________ :______________   :______________   ___ 
     I/O ____//////////////////////////////\:_______1______X-X_______2_______X-X___ 
        5us <= t10                          10us <= t14 <= 100us Clock low after RST 
        5us <= t11                          10us <= t15 <= 50us  Clock High 
       50us <= t12 ........ Reset High      10us <= t16 <= 100us Clock Low 
               t13 <= 10us  Propagation delay       t17 <= 10us  Propagation delay 
                Figure2 : Reset of the card when a synchronous answer is expected. 
                ~~~~~~~ 
        NOTES: 
        1 -  The internal state of the card is assumed not to be defined before 
        reset. Therefore the design of the card has to avoid inproper operation. 
        2 - In order to continue the dialogue with the card, RST shall be maintained 
        in the state where an answer occurs on I/O. 
        3 - Reset of a card can be initiated by the interface device at its 
        discetion at any time. 
        4 - Interface devices may support one or more of these types of reset 
        behaviour. The priority of testing for asynchronous or synchronous cards is 
        not defined in this standard. 
        c - Deactivation of the contacts 
            ---------------------------- 
        When informations exchange is terminated or aborted (unresponsive card or 
        detection of card removal), the electrical contacts shall be desactivated. 
        The deactivation by the interface device shall consist of the consecutive 
        operations: 
            - State L on RST; 
            - State L on CLK; 
            - Vpp inactive; 
            - State A on I/O; 
            - VCC inactive; 
        2.3.4) Answer to Reset: 
               --------------- 
        Two types of transmissions are considered: 
        * Asynchronous transmission: 
          In this type of transmission, characters are transmitted on the I/O line 
          in an asynchronous half duplex mode. Each character includes an 8bit byte. 
        * Synchronous transmission: 
          In this type of transmission, a serie of bits is transmitted on the I/O 
          line in half duplex mode in synchronisation with the clock signal on CLK. 
        a - Answer to Reset in asynchronous transmission 
            -------------------------------------------- 
        * Bit duration 
          """""""""""" 
          The nominal bit duration used on I/O is defined as one Elementary Time 
          Unit (etu). 
          For cards having internal clock, the initial etu is 1/9600 s. 
          For cards using the external clock, there is a linear relationship between 
          the Elementary Time Unit used on I/O  and the period provided by the 
          interface device on CLK. 
             The initial etu is 372/fi s  where fi is in Hertz. 
          The initial frequency fi is provided by the interface device on CLK during 
          the Answer to Reset. 
          In order to read the initial character (TS), all cards shall initially be 
          operated with fi in the range of 1 MHz to 5 MHz. 
        * Character frame during answer to reset 
          """""""""""""""""""""""""""""""""""""" 
          Prior to the transmission of a character, I/O shall be in state Z. 
          A character consists of ten consecutive bits: 
             - a start bit in state A; 
             - eight bits of information, designated ba to bh and conveying a 
               data byte; 
             - a tenth bit bi used for even parity checking. 
          A data byte consists of 8 bits designated b1 to b8, from the least 
          significant bit (lsb, b1) to the most significant bit (msb, b8). 
          Conventions (level coding, connecting levels Z/A to digits 1 or 0: and a 
          bit significance, connecting ba...bh to b1...b8) are specified in the 
          initial character, call TS, which is transmitted by the card in response 
          to reset. 
          Parity is correct when the number of ONES is even in the sequence from 
          ba to bi. 
          Whithin a character, the time from the leading edge of the start bit to 
          the trailing edge of the nth bit shall equal (n+/-0.2) etu. 
          When searching for a start, the receiver samples I/O periodically. The 
          time origin being the mean between last observation of level Z and first 
          observation of level A, the start shall be verified before 0.7 etu, and 
          then ba is received at (1.5 +/-0.2) etu. Parity is checked on the fly. 
          NOTE : When searching for a start, the sampling time shall be less than 
          0.2 etu so that all the test zones are distinct from the transition zones. 
          The delay between two consecutives characters (between start leading 
          edges) is at least 12 etu, including a character duration (10+/-0.2) etu 
          plus a guardtime, the interface device and the card reamain both in 
          reception, so that I/O is in state Z. 
                 Start                          Parity             Next 
                  bit <----- 8 data bits -----> bit              Start bit 
          Z   ____     ________________________________......______     __ 
                  |   |  |  |  |  |  |  |  |  |  |                 |   | 
          I/O     |   |ba|bb|bc|bd|be|bf|bg|bh|bi|     Guardtime   |   | 
                  |___|__|__|__|__|__|__|__|__|__|                 |___|_ 
          A       :   :                    :     : 
                  0   t1                   :    t10 
                  :                        : 
                  :<---- (n+/-0.2) etu --->: 
                               Figure 3: Character frame 
                               ~~~~~~~~ 
          During the Answer to Reset, the delay between the start leading edges of 
          two consecutives characters from the card shall not exeed 9600 etu. This 
          maximum is named initial waiting time. 
        * Error detection and character repetition 
          """""""""""""""""""""""""""""""""""""""" 
          During the answer to reset, the following characters repetition procedure 
          depends on the protocol type. This procedure is mandatory for cards using 
          the protocol type T=0; it is optional for the interface device and for the 
          other cards. 
          The transmitter tests I/O (11+/-0.2) etu after the start leading edge: 
              - If I/O is in state Z, the correct reception is assumed. 
              - If I/O is in state A, the transmission is assumed to have been 
                incorrect. The disputed character shall be repeated after a delay 
                of at least 2 etu after detection of the error signal. 
          When parity is incorrect, from (10.5+/-0.2) etu, the receiver transmits 
          an error signal at state A for 1 etu minimum and 2 etu maximum.  The 
          receiver then shall expect a repetition of the disputed character (see 
          figure 8). 
          If no character repetition is provided by the card, 
              - The card ignores and shall not suffer damage from the error signal 
                coming from the interface device. 
              - The interface device shall be able to initiate the reception and the 
                whole Answer to Reset response sequence. 
        * Structures and content 
          """""""""""""""""""""" 
          A reset operation results in the answer from the card consisting of the 
          initial character TS followed by at most 32 characters in the following 
          order: 
              - T0 ................... Format character     (Mandatory) 
              - TAi, TBi, TCi, TDi ... Interface characters  (Optional) 
              - T1, T2, ... ,TK ...... Historical characters (Optional) 
              - TCK .................. Check character    (Conditional) 
     Reset 
      | 
      |    _________________________________________         _______   _________ 
      |   |   |   |   |   |   |   |   |   |   |   |           |   |     |   |   | 
      '-->| TS| T0|TA1|TB1|TC1|TD1|TA2|TB2|TC2|TD2| ......... | T1| ... | TK|TCK| 
          |___|___|___|___|___|___|___|___|___|___|_         _|___|_   _|__ |___| 
          TS  : Initial character 
          TO  : Format character 
          TAi : Interface character [ codes FI,DI ] 
          TBi : Interface character [ codes II,PI1 ] 
          TCi : Interface character [ codes N ] 
          TDi : Interface character [ codes Yi+1, T ] 
          T1, ... , TK : Historical characters (max,15) 
          TCK : Check character 
              Figure 4 : General configuration of the Answer to Reset 
              ~~~~~~~~ 
          The interface characters specify physical parameters of the integrated 
          circuit in the card and logical characteristics of the subsequent exchange 
          protocol. 
          The historical characters designate general information, for exemple, the 
          card manufacturer, the chip inserted in the card, the masked ROM in the 
          chip, the state of the life of the card. The specification of the 
          historical characters falls outside the scope of this part of ISO/IEC7816. 
          For national simplicity, T0, TAi, ... ,TCK will designate the bytes as 
          well as the characters in which they are contained. 
          Structure of TS, the initial character 
          -------------------------------------- 
          The initial character TS provides a bit shynchronisation sequence and 
          defines the conventions to code data bytes in all subsequent characters. 
          These conventions refer to ISO1177. 
          I/O is initially in state Z. A bit synchronisation sequence (Z)AZZA is 
          defined for the start bit and bits ba bb bc (see figure 5). 
          The last 3 bits bg bh bi shall be AAZ for checking parity. 
          NOTE : This allows the interface device to determinate the etu initially 
          used by the card. An alternate measurement of etu is a third of the delay 
          between the first two falling edges in TS. Transmission and reception 
          mechanisms in the card shall be consistent with the alternate definition 
          of etu. 
          The two possible values of TS (ten consecutive bits from start to bi and 
          corresponding hexadecimal value) are 
              - Inverse convention : (Z)ZZAAAAAZ 
                where logic level ONE is A, ba is b8 (msb is first), equal to $3F 
                when decoded by inverse convention. 
              - Direct convention  : (Z)ZZAZZZAAZ 
                where logic level ONE is Z, ba is b1 (lsb first), equal to $3B 
                when decoded by direct convention. 
                      Start  ba  bb  bc  bd  be  bf  bg  bh  bi 
               Z   ____     _______     ___________         ______ 
                       |   |   |   |   | Z   Z   Z |       |       |   | 
                    (Z)| A | Z   Z | A |     or    |       | Z  (Z) 
               A       |___|       |___|_A___A___A_|___|___| 
                         Figure 5 : Initial character TS 
                         ~~~~~~~~ 
          Structure of the subsequent characters in the Answer to Reset 
          ------------------------------------------------------------- 
          The initial character TS is followed by a variable number of subsequent 
          characters in the following order: The format character T0 and, optionally 
          the interface characters TAi, TBi, TCi, TDi and the historical characters 
          T1, T2, ... , TK and conditionally, the check character TCK. 
          The presence of the interface characters is indicated by a bit map 
          technique explained below. 
          The presence of the historical characters is indicated by the number of 
          bytes as specified in the format character defined below. 
          The presence of the check character TCK depends on the protocol type(s) 
          as defined as below. 
          - Format character T0 
            ~~~~~~~~~~~~~~~~~~~ 
          The T0 character contains two parts: 
              - The most significant half byte (b5, b6, b7, b8) is named Y1 and 
              indicates with a logic level ONE the presence of subsequent characters 
              TA1, TB1, TC1, TD1 respectively. 
              - The least significant half byte (b4 to b1) is named K and indicates 
              the number (0 to 15) of historical characters. 
              ,----,----,----,----,----,----,----,----, 
              | b8 | b7 | b6 | b5 | b4 | b3 | b2 | b1 | 
              '----'----'----'----'----'----'----'----' 
              :<------- Y1 ------>:<-------- K ------>: 
              Y1 : indicator for the presence of the interface characters 
                     TA1 is transmitted when b5=1 
                     TB1 is transmitted when b6=1 
                     TC1 is transmitted when b7=1 
                     TD1 is transmitted when b8=1 
              K : number of hitorical characters 
                         Figure 6 : Informations provided by T0 
                         ~~~~~~~~ 
          - Interface characters TAi, TBi, TCi, TDi 
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
          TAi, TBi, TCi (i=1, 2, 3, ... ) indicate the protocol parameters. 
          TDi indicates the protocol type T and the presence of subsequent 
          characters. 
          Bits b5, b6, b7, b8 of the byte containing Yi (T0 contains Y1; TDi 
          contains Yi+1) state whelther character TAi for b5, character TBi for b6, 
          character TCi for b7, character TDi for b8 are or are not (depending on 
          whelther the relevant bit is 1 or 0) transmitted subsequently in this 
          order after the character containing  Yi. 
          When needed, the interface device shall attribute a default value to 
          information corresponding to a non transmitted interface character. 
          When TDi is not transmitted, the default value of Yi+1 is null, indicating 
          that no further interface characters TAi+j, TBi+j, TCi+j, TDi+j will be 
          transmitted. 
              ,----,----,----,----,----,----,----,----, 
              | b8 | b7 | b6 | b5 | b4 | b3 | b2 | b1 | 
              '----'----'----'----'----'----'----'----' 
              :<------ Yi+1 ----->:<------- T ------->: 
              Yi+1 : indicator for the presence of the interface characters 
                     TAi+1 is transmitted when b5=1 
                     TBi+1 is transmitted when b6=1 
                     TCi+1 is transmitted when b7=1 
                     TDi+1 is transmitted when b8=1 
              T : Protocol type for subsequent transmission. 
                         Figure 7 : Informations provided by TDi 
                         ~~~~~~~~ 
          - Historical characters T1, T2, ... ,TK 
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
          When K is not null, the answer to reset is continued by transmitting K 
          historical characters T1, T2, ... , TK. 
          - Check character TCK 
            ~~~~~~~~~~~~~~~~~~~ 
          The value of TCK shall be such that the exclusive-oring of all bytes from 
          T0 to TCK included is null. 
          The answer to reset is complete 12 etu after the leading edge of the last 
          character. 
          Protocol type T 
          --------------- 
          The four least significant bits of any interface character TDi indicate a 
          protocol type T, specifying rules to be used to process transmission 
          protocols. When TDi is not transmitted, T=0 is used. 
          T=0 is the asynchronous half duplex character transmission protocol. 
          T=1 is the asynchronous half duplex block transmission protocol. 
          T=2 and T=3 are reserved for future full duplex operations. 
          T=4 is reserved for an enhanced asynchronous half duplex character 
              transmission protocol. 
          T=5 to T=13 are reserved for future use. 
          T=14 is reserved for protocols standardized by ISO. 
          T=15 is reserved for future extension. 
          NOTE : If only T=0 is indicated, TCK shall not be sent. In all other cases 
          TCK shall be sent. 
          Specifications of the global interface bytes 
          -------------------------------------------- 
          Among the interface bytes possibly transmitted by the card in answering to 
          reset, this subclaus defines only the global interface bytes TA1, TB1, 
          TC1, TD1. 
          These global interface bytes convey information to determine parameters 
          which the interface device shall take into account. 
          - Parameters F, D, I, P, N 
            ~~~~~~~~~~~~~~~~~~~~~~~~ 
          This initial etu is used during answer to reset is replaced by the work 
          etu during subsequent transmission. F is the clock rate conversion factor 
          and D is the bit rate adjustment factor to determine the work etu in 
          subsequent transmissions. 
          For internal clock cards: 
             initial etu = 1/9600 s        work etu = (1/D)*(1/9600) s 
          For external clock cards: 
             initial etu = 372/fi s        work etu = (1/D)*(F/fs) s 
          The minimum value of fs shall be 1MHz. 
          The maximum value of fs is given by table 6. 
         I and P define the active state at VPP. 
            - Maximum programming current : Ipp = 1mA 
            - Programming voltage         : Vpp = P.V 
          N is an extra guardtime requested by the card. Before receiving the next 
          character, the card requires a delay of at least (12+N) etu from the start 
          leading edge of the previous character. No extra guardtme is used to send 
          characters from the card to the interface device. 
          The default values of these parameters are: 
             F = 372 ;   D = 1 ;  I = 50 ;  P = 5 ;  N = 0 
          - Integer values in global interface bytes 
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
          The global interface bytes, TA1, TB1, TC1, TB2 code integer values FI, DI 
          II, PI1, N, PI2 which are either equal to or used to compute the values of 
          the parameters F, D, I, P, N presented above. 
          TA1 codes FI over the most significant half byte (b8 to b5) and DI over 
          the least significant half byte (b4 to b1). 
          TB1 codes II over the bits b7 and b6, and PI1 over the 5 least significant 
          bits b5 to b1. The most significant bit b8 equals to 0. 
          NOTE : The interface device may ignore the bit b8 of TB1. 
          TC1 codes N over the eight bits (b8 to b1). 
          TB2 codes PI2 over the eight bits (b8 to b1). 
          Table 6: Clock rate conversion factor F 
          ~~~~~~~ 
          ---------------------------------------------------------------------- 
                 FI     |     0000      0001  0010  0011  0100  0101  0110  0111 
          --------------+------------------------------------------------------- 
                 F      | Internal clk   372   558   744  1116  1488  1860  RFU 
          --------------+------------------------------------------------------- 
           fs (max) MHz |      -           5     6     8    12    16    20   - 
          ---------------------------------------------------------------------- 
          --------------------------------------------------------------- 
                 FI     | 1000  1001  1010  1011  1100  1101  1110  1111 
          --------------+------------------------------------------------ 
                 F      |  RFU   512   768  1024  1536  2048   RFU  RFU 
          --------------+------------------------------------------------ 
           fs (max) MHz |  -       5   7.5    10    15    20    -    - 
          --------------------------------------------------------------- 
           RFU : Reserved for Future Use 
          Table 7: Bit rate afjustment factor D 
          ~~~~~~~ 
          ------------------------------------------------------- 
             DI | 0000  0001  0010  0011  0100  0101  0110  0111 
          ------+------------------------------------------------ 
             D  |  RFU     1     2     4     8    16   RFU   RFU 
          ------------------------------------------------------- 
          ------------------------------------------------------- 
             DI | 1000  1001  1010  1011  1100  1101  1110  1111 
          ------+------------------------------------------------ 
             D  |  RFU   RFU   1/2   1/4   1/8  1/16  1/32  1/64 
          ------------------------------------------------------- 
           RFU : Reserved for Future Use 
          - Programming voltage factor P 
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
          PI1 from 5 to 25 gives the value of P in volts. PI1=0 indicates that VPP 
          is connected in the card which generates an internal programming voltage 
          from VCC. Other values of PI1 are reserved for future use. 
          When PI2 is present, the indication of PI1 should be ignores. PI2 from 50 
          to 250 gives the value of P in 0.1V. Other values of PI2 are reserved for 
          future use. 
          Table 8 : Maximum programming current factor I 
          ~~~~~~~ 
          ------------------------------- 
           II  |   00    01    10    11 
          -----+------------------------- 
           I   |   25    50   100   RFU 
          ------------------------------- 
          - Extra guardtime N 
            ~~~~~~~~~~~~~~~~~ 
          N codes directly the extra guard time, from 0 to 254 etu. N=255 indicates 
          that the minimum delay between the start edges of two consecutives 
          characters is reduced to 11 etu. 
        b - Answer to Reset in synchronous transmission 
            ------------------------------------------- 
        * Clock frequency and bit rate 
          """""""""""""""""""""""""""" 
          There is a linear relationship between the bit rate on the I/O line and 
          the clock frequency provided by the clock interface device on CLK. 
          Any clock frequency between 7kHz and 50kHz may be chosen for the reset 
          sequence. A clock frequency of 7kHz corresponds to 7kbit/s, and values 
          of the clock frequency up to 50kHz cause corresponding bit rates to be 
          transmitted. 
        * Structure of the header of the Answer to Reset 
          """""""""""""""""""""""""""""""""""""""""""""" 
          The reset operation results in an answer from the card containing a header 
          transmitted from the card to the interface. The header has a fixed length 
          of 32 bits and begins with two mandatory fields of 8 bits, H1 and H2. 
          The chronological order of transmission of information bits shall 
          correcpond to bit identification b1 to b32 with the least significant bit 
          transmitted first. The numerical meaning corresponding to each information 
          bit considered in isolation is that of the digit. 
                - 0 for a unit corresponding to state A (space) 
                - 1 for a unit corresponding to state Z (mark) 
        * Timing of the haeder 
          """""""""""""""""""" 
          After the reset procedure, the output information is controlled by clock 
          pulses. The first clock pulse is applied between 10us and 100us (t14) 
          after the falling edge on RST to read the data bits from the card. State H 
          of the clock pulses can be varied between 10us and 50us (t15) and state L 
          between 10us and 100us (t16). 
          The first data bit is obtained on I/O while the clock is low and is valid 
          10us (t13) at least after the falling edge on RST. The following data bits 
          are valid 10us (t17) at least after the falling edge on CLK. Each data bit 
          is valid until the next falling edge the following clock pulse on CLK. The 
          data bits can therefore be sampled at the rising edge of the following 
          clock pulses. 
        * Data content of the header 
          """""""""""""""""""""""""" 
          The header allows a quick determination of whelther the card and the 
          interface device are compatible. If there is no compatibility, the 
          contacts shall be desactivated. 
          The first field H1 codes the protocol type. The values of the codes and 
          the corresponding protocol type are 
               Hexadecimal value   protocol type 
               ----------------------------------- 
                00 and ff          not to be used 
                01 to FE           each value is assigned 
                                   by ISO/IEC JTC1/SC17 to 
                                   one protocol type 
          The second field H2 codes parameters for the protocol type coded in field 
          H1. The values of H2 are to be assigned by ISO/IEC JTC1/SC17. 
        2.3.5) Protocol type selection (PTS) 
               ----------------------------- 
        If only one protocol type and FI=D=1 (default value of TA1) and N smaller 
        than 255 is indicated in the answer to reset. The transmission protocol 
        associated to the protocol type may be started immediately after the 
        transmission of answer to reset. 
        If more than one protocol type and/or TA1 parameter values other than the 
        default values and/or N equeal to 255 is/are indicated in the answer to 
        reset, the card shall know unambiguously, after having sent the answer to 
        reset, which protocol type or/and transmission parameter values (FI, D, N) 
        will be used. Consequently a selection of the protocol type and/or the 
        transmission parameters values shall be specified. 
        If the card is able to process more than one protocol type and if one of 
        those protocol types is indicated as T=0, then the protocol type T=0 shall 
        indicated in TD1 as the first offered protocol, and is assumed if no PTS is 
        performed. 
        If a card offers more than one protocol and if the interface device supports 
        only one of these protocols which is not T=0 and does not support PTS, the 
        interface should reject or reset the card. 
        2.3.5.a - PTS protocol 
                  ------------ 
        Only the interface device is permitted to start a PTS procedure: 
           - The interface device sends a PTS request to the card. 
           - If the card receives a correct PTS request, it answers by sending a PTS 
             confirm, if implemented or the initial waiting time will be exceeded. 
           - After the succesfull exchange of PTS request and PTS confirm, data 
             shall be transmitted from the interface device using the selected 
             protocol type and/or transmission parameters. 
           - If the card receives an erronous PTS request, it will not send a PTS 
             confirm. 
           - If the initial waiting time is exceeded, the interface device should 
             resetor reject the card. 
           - If the interface device receives an erroneous PTS confirm, it should 
             reset or reject the card. 
        The parameters for the transmission of the PTS request and PTS confirm shall 
        correspond to those used within the Answer to Reset regarding the bit rate 
        and the convention detected by TS and possibly modified by TC1. 
        2.3.5.b - Structure and content of PTS request and PTS confirm 
                  ---------------------------------------------------- 
        The PTS request and PTS response each consist of one initial character PTSS, 
        followed by a format character PTS0, three optional parameter characters 
        PTS1 PTS2 PTS3, and a character check PCK at the last byte. 
        PTSS identifies the PTS request or PTS confirm and is coded FF. 
        PTS0 indicates by the bits b5, b6, b7 set to 1 the presence of the 
        subsequently sent optional characters PTS1, PTS2, PTS3 respectively. It 
        codes over the least significant bits b4 to b1 the selected protocol type T 
        as coded in TD bytes. The most significant bit b8 (default b8=0) is reserved 
        for future use. 
        PTS1 codes the parameter values FI and D as coded in TA1. The interface 
        device may send PTS1 in order to indicate the selection FI and/or D values 
        to the card. If PTS1 is not sent, FI=1 and D=1 are assumed as defaults. The 
        card either acknoledges both the FI and D values by echoing PTS1 or does not 
        send PTS1 indicating the use of the default values. 
        PTS2 indicates the support of N=255, when bit b1 is set to 1. Bit b1 set to 
        0 is the default and indicates that the 11 etu period is not used. If bit b2 
        is set to 1, the card shall use an extra guardtime of 12 etu for its 
        transmssion of characters to the interface device. Bit b2 set to 0 is the 
        default and indicates that no extra guardtime is required. Bit b3 to b8 are 
        reserved for future use. 
        If PTS2 is sent by the interface device and is not echoed by the card, the 
        interface device should reject or reset the card. 
        The coding and use of PTS3 is not defined. 
        The value of PCK shall be such that the exclusive-oring of all charcters 
        from PTSS to PCK included is null. 
        2.3.6) Protocol type T=0, asynchronous half duplex character transmission 
               protocol---------------------------------------------------------- 
               -------- 
        This clause defines the structure and processing of commands initiated by an 
        interface device for transmission control and for card specific control in 
        an asynchronous half duplex character transmission protocol. 
        This protocol uses the parameters indicated by the answer to reset, unless 
        modified by the protocol type selection. 
        2.3.6.a - Specific interface parameters: the work waiting time 
                  ---------------------------------------------------- 
        In an answer to reset, the interface character TC2 codes the integer value 
        WI over eight bits b8 to b1. When no TC2 appears in the answer to reset, the 
        default value of WI is 10. 
        The interval between the start leading edge of any character sent by the 
        card and the start leading edge of the previous character (sent either by 
        the card or by the interface device) shall not exceed 960*OWI work etu. This 
        maximum delay is named the work waiting time. 
        2.3.6.b - Structure and processing of commands 
                  ------------------------------------ 
        A command is always initiated by the interface device. It tells the card 
        what to do in a 5-byte header, and allow a transfer of data bytes under 
        control of procedure bytes sent by the card. 
        It is assumed that the card and the interface device know a priori the 
        direction of data, in order to ditinguish between instructions for incoming 
        data transfer (where data enter the card during execution) and instructions 
        for outgoing data transfers (where data leave the card during execution). 
     without parity error 
     ~~~~~~~~~~~~~~~~~~~~ 
             Start                                    Start 
        _____    _____________________________________    ___________ 
             |  |  |  |  Byte i   |  |  |P |          |  |  Byte i+1 
             |__|__|__|__|__|__|__|__|__|__| guartime |__|___________ 
                                        Even 
     with a parity error               parity 
     ~~~~~~~~~~~~~~~~~~~                bit 
             Start                                        Start 
        _____    ______________________________ Error   __    ___________ 
             |  |  |  |  Byte i   |  |  |P |  | signal |  |  |  Byte i+1 
             |__|__|__|__|__|__|__|__|__|__|  |________|  |__|___________ 
                Figure 8 : Byte transmission diagram 
                ~~~~~~~~ 
        * Command header sent by the interface device 
          """"""""""""""""""""""""""""""""""""""""""" 
          The interface device transmits a header over five successive bytes 
          designated CLA, INS, A1, A2, L. 
          - CLA is an instruction class. The value FF is reserved for PTS. 
          - INS is an instruction code in the instruction class. The instruction 
            code is valid only if the least significant bit is 0, and the most 
            significant half byte is neither 6 nor 9. 
          - P1, P2 are a reference (e.g. an address) completing the instruction code 
          - P3 codes the number n of data bytes (D1, ... , Dn) which are to be 
            transmitted during the command. The direction of movement of these data 
            is a function of the instruction. In an outgoing data transfer command, 
            P3=0 introduces a 256 byte data transfer from the card. In an incoming 
            data transfer command, P3=0 introduces no transfer of data. 
          All remaining encoding possibilities for the header are specified in 
          subsequent parts of ISO7816. 
          After transmission of such 5 byte header, the interface device waits for a 
          procedure byte. 
        * Procedure bytes sent by the card 
          """""""""""""""""""""""""""""""" 
          The value of the procedure bytes shall indicate the action requested by 
          the interface device. Three types of procedure bytes are specified: 
          - ACK : (The seven most significant bits in an ACK byte are all equal or 
            complementary to those in the INS byte, apart from the values 6x and 9x) 
            The interface device control VPP state and exchanges data depending on 
            ACK values. 
          - NULL : (=$60) This byte is sent by the card to restart the working time, 
            end to anticipate a subsequent procedure byte. It requests no further 
            action neither on VPP nor on Data. 
          - SW1 (= $6x or $9x, expect $60); The interface device maintains or sets 
            VPP at idle and waits for a SW2 byte to complete the command. 
          Any transition of VPP state (active/idle) must occur within the guardtime 
          of the procedure byte, or on the work waiting time overflow. 
          At each procedure byte, the card can proceed with the command by an ACK or 
          NULL byte, or show its disaproval by becoming unresponsive, or conclude by 
          an end sequence SW1-SW2. 
         Byte | Value |  Result 
         -----+-------+------------------------------------------------------------ 
              | INS   | VPP is idle. All remaining data bytes are transferred 
              |       | subsequently. 
              |       | 
              | INS+1 | VPP is active. All remaining data bytes are transferred 
              |       | subsequently. 
         ACK  | ___   | 
              | INS   | VPP is idle. Next data byte is transferred subsequently. 
              | _____ | 
              | INS+1 | VPP is active. Newt data byte is transferred subsequently. 
         -----+-------+------------------------------------------------------------ 
         NULL | $60   | No futher action on VPP. The interface device waits for a 
              |       | new procedure byte 
         -----+-------+------------------------------------------------------------ 
         SW1  | SW1   | VPP is idle. The interface device waits for a SW2 byte 
          Acknoledge bytes 
          ---------------- 
          The ACK bytes are used to control VPP state and data transfer. 
            - When exclusive-oring the ACK byte with the INS byte gives $00 or $FF, 
              the interface device maintains or sets VPP as idle. 
            - When exclusive-oring the ACK byte with the INS byte gives $01 or $FE, 
              the interface device maintains or sets VPP as active. 
            - When the seven most significant bits in the ACK byte have the same 
              value as those in the INS byte, all remaining data bytes (Di, ..., Dn) 
              if any remain, are transferred subsequently. 
            - When the seven most significant bits in the ACK byte are complementary 
              to those in the INS byte, only the next data byte (Di), if one remains 
              is transferred. 
          After these actions, the interface device waits for a new procedure. 
          Null byte (= $60) 
          ----------------- 
          This byte is sent by the card to reset the workwaiting time and to 
          anticipate a subsequent procedure byte. 
          Status bytes (SW1=$6x or $9x, expect $60; SW2 any value) 
          -------------------------------------------------------- 
          The end sequence SW1-SW2 gives the card status at the end of the command. 
          The normal ending is indicated by SW1-SW2 = $90-$00. 
          When the most significant half byte SW1 is $6, the meaning of SW1 is 
          independant of the application. The following five values are defined: 
            $6E The card does not support the instruction class. 
            $6D The instruction code is not programmed or is invalid. 
            $6B The reference is incorrect. 
            $67 The length is incorrect. 
            $6F No precise diagnostic is given. 
          Other values are reserved for future use by ISO7816. 
          When SW1 is neither $6E nor $6D, the card support the instruction. 
          This part of ISO7816 does not interprets neither $9X SW1 bytes, nor SW2 
          bytes; Their meaning relates to the application itself. 

References

Category:Memory Connectors

 

© 1998-2018 – Nicola Asuni - Tecnick.com - All rights reserved.
about - disclaimer - privacy