AN2284 datasheet(27/40 Pages) STMICROELECTRONICS

27 / 40 page

AN2284

7 ISO 7816-3 - Electronic Signal and Transmission Protocol

27/40

The Manage Channel command is used by the reader application to open and close the logical

communication channels between it and the card. Initially the card opens a basic

communication channel by establishing an application-level protocol with the reader application

through the completion of an ATR sequence. This channel is then used to open or close

additional logical channels through the Manage Channel command.

Envelope:

This command supports the use of secure messaging using the T=0 protocol. It enables an

APDU to be encrypted and then incorporated into the Envelope command's data section (of its

APDU). The APDU processor on the card can then extract and execute the command.

Get Response:

As with the previous command, the Get Response command allows the use of the T=0 protocol

for transferring APDUs. The Case 4 type of APDU cannot be supported by the T=0 protocol i.e.

it is not possible to send a block of data to the card and then receive a block of data in return.

So when using the T=0 protocol, the initial command results in a response which indicates that

more data is waiting to be sent by the card. The Get Response command is then used to

retrieve this data.

AN2284 Folha de dados(PDF) 27 Page - STMicroelectronics