AN3955 datasheet(40/68 Pages) STMICROELECTRONICS

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ISO/IEC 14443-3 layers

AN3955

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Doc ID 022017 Rev 1

5.2

ISO/IEC 14443-3 Type B layer

The ISO/IEC 14443-3 Type B layer is composed of:

●

the lib_iso14443B.c source file

●

the lib_iso14443B.h include file

5.2.1

ISO/IEC 14443-3 Type B command format

The ISO/IEC 14443-3 Type B specification defines the following command frame:

with:

SOF: Start of Frame

Data: 1 byte or more

CRC: 2 bytes

EOF: End of Frame

5.2.2

EOF and SOF

The EOF and SOF are managed by CR95HF.

5.2.3

Data management

The command code and data must be managed by the user application.

5.2.4

ISO/IEC 14443-3 Type B CRC16 management

The ISO/IEC 14443-3 Type B specification defines a two-byte CRC. It is appended to RF

commands to check the data transmission between CR95HF and a contactless tag.

The bit number 0 of a parameter byte of ProtocolSelect command controls the CRC. When

this bit is set to 1, the CR95HF appends the CRC to all RF commands.

The ProtocolSelect command sets this bit, thus the CR95HF manages the CRC.

5.2.5

Functions of ISO/IEC 14443-3 Type B layer

Table 57 describes the function to configure the CR95HF to communicate with an ISO/IEC

14443 Type B contactless tag.

SOF

Data

CRC

EOF

Table 57.

ISO/IEC14443-3 Type B configuration function description

Function

Description

ISO14443B_ProtocolSelect

Configures CR95HF to communicate with an ISO/IEC

14443 Type B contactless tag.

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