AN2646 datasheet(19/43 Pages) STMICROELECTRONICS

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AN2646 - Application note

ISO 7816-4 – smartcard commands

19/43

The INS byte is used to identify a specific instruction within a class of instructions identified

by the value of CLA.Table 9. lists the instructions in the ISO 7816-4 standard used to access

file system and security functions.

The parameters P1 and P2 are defined at the link level but are actually dependent on the

specific instruction (application level). They provide control or addressing parameters for the

various application-specific instructions. For example, in the Select File instruction, P1 is

used to indicate how the file will be referred to (by identifier, name, path etc.) and P2 offers

further refinement as to which file is to be selected. P3 defines the number of bytes to be

transmitted during the execution of the INS specified instruction. The convention used to

indicate movement of data is card-centric that is, outgoing refers to data moving from the

card to the reader and incoming refers to data moving from the reader to the card.

For each command TDPU sent from the reader, a response TPDU is sent by the card. The

response includes three mandatory fields and one optional field (all one byte in length):

●

ACK: indicates that the card has received the [CLA, INS] command

●

NULL: used for flow control on the I/O channel by the card. It signals (to the reader) that

the card is still processing the command and so the reader must wait before sending

another command

●

SW1: status response of the current command

●

SW2: (optional) also conveys a status response to the reader

Table 8.

CLA instruction set definitions

CLA byte

Instruction set

ISO 7816-4 instructions (files and security)

10 to 7F

Reserved for future use

8x or 9x

ISO 7816-4 instructions

Application/vendor specific instructions

B0 to CF

ISO 7816-4 instructions

D0 to FE

Application/vendor specific instructions

Reserved for protocol type selection

Table 9.

ISO 7816-4 INS codes

INS value

Command name

INS value

Command name

Erase Binary

Get Response

Verify

Envelope

Manage Channel

Get Data

External Authenticate

Write Binary

Get Challenge

Write Record

Internal Authenticate

Update Binary

Select File

Put Data

Read Binary

Update Record

Read Record(s)

Append Record

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