AN3985 datasheet(30/105 Pages) STMICROELECTRONICS

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ISO/IEC 15693 layer

AN3985

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Doc ID 022255 Rev 2

This structure is defined in ISO15693_structure.h.

typedef struct

{

u8 command_ok;

u8 error_code;

u8 response_flags;

u8 dataField[ISO15693_DATA_RECEIVED_MAX_SIZE];

u8 receivedDataLength;

u8 UID_Tag[ISO15693_UID_SIZE];

u8 AFI_Tag;

u8 DSFID_Tag;

u8 ICRef;

u8 memSize[ISO15693_MEMSIZE_MAX_WORD_BYTE_SIZE];

}ISO15693_Tag;

5.3

ISO/IEC 15693 command format

The commands defined by ISO/IEC 15693 specification have the following structure

With:

●

SOF: start of frame

●

Request flag: 1 byte

●

Command code: 1 byte

●

Data: 1 or more byte

●

CRC: 2 bytes

●

EOF: end of frame

5.3.1

SOF and EOF

The SOF and EOF are managed by CR95HF device.

5.3.2

Request flag management

The request flags byte is managed by the user application. Each bit or flag specifies the

actions to be carried out by the contactless tag and whether the corresponding fields are

present or not.

The request flags is a byte integrated on all ISO/IEC 15693 commands, which specifies the

actions to be performed by the contactless tag.

The meaning of bit 1, 2 and 4 is the same for all ISO/IEC 15693 commands.

Bit 3 (Inventory_flag) of the request flag defines the contents of the 4 MSBs (bits 5 to 8).

When bit 3 is reset (0), bits 5 to 8 contain the contactless tag selection criteria. When bit 3 is

set (1), bits 5 to 8 define the contactless tag Inventory parameters.

SOF

Request flag

Command code

Data

CRC

EOF

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