AN3955 datasheet(29/68 Pages) STMICROELECTRONICS

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AN3955

ISO/IEC 14443-3 layers

Doc ID 022017 Rev 1

29/68

The Is functions return RESULTOK if the function is successful, otherwise the Is functions

return ERRORCODE_GENERIC. Table 30 lists the Is functions.

The GET functions return an information field. Table 31 describes the GET functions.

Table 31.

ISO/IEC 14443-3 Type A GET function description

The advanced functions use the select sequence of one tag to manage a specific sequence.

Table 32 describes the advanced functions.

Table 32.

ISO/IEC 14443-3 Type A Advanced function description

Table 30.

ISO/IEC 14443-3 Type A Is function description

Function

Description

ISO14443A_IsCollisionDetected

Checks if the collision bit of the CR95HF control byte is set

(collision detected).

ISO14443A_IsCRCError

Checks if the CRC bit of the CR95HF control byte is set

(CRC error detected).

ISO14443A_IsParityError

Checks if the Parity bit of the CR95HF control byte is set

(parity error detected).

ISO14443A_IsCorrectBCC

Checks if BCC byte matches the data.

ISO14443A_IS14443_4Compatible

Checks if the contacless tag is compliant with ISO/IEC

14443_4 specification.

ISO14443A_ISUIDComplete

Checks if the UID is completed.

ISO14443A_IsPresent

Checks if a 14443-3 Type A tag is present in the RF field.

Function

Description

ISO14443A_GetSignificantBit

Returns the number of significant bit of the byte. This

information is extracted from control bytes of CR95HF.

ISO14443A_GetFirstCollisionByte

Returns the index of the first byte where the collision is

detected. This information is extracted from control bytes

of CR95HF.

ISO14443A_GetFirstCollisionBit

Returns the index of the first bit where the collision is

detected. This information is extracted from control bytes

of CR95HF.

Function

Description

ISO14443A_SelectSequence

Runs a select sequence as defined in ISO/IEC 14443-3

specification.

ISO14443A_GetUIDsize

Returns UID size (information extracted from ATQA

contactless tag response).

ISO14443A_GetUID

Returns UID of a contacless tag.

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