AN3955 datasheet(42/68 Pages) STMICROELECTRONICS

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ISO/IEC 14443-3 layers

AN3955

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Doc ID 022017 Rev 1

5.2.6

CR95HF configuration function

The CR95HF configuration function sends a ProtocolSelect command to the CR95HF

device to select the ISO/IEC 14443-3 Type B protocol. The transmission and reception data

rates are integrated in the command. This command turns on the RF field.

Table 62 describes the ISO14443B_ProtocolSelect function.

Note:

The Bit 0 (Append CRC) is automatically set inside this function enabling the CR95HF to

manage the CRC of the RF command.

For more information, refer to Section 5.2.4: ISO/IEC 14443-3 Type B CRC16 management.

5.2.7

ISO/IEC 14443-3 Type B Set function

The ISO14443B_SetParamByte function returns PARAM byte, which is the result of the

concatenation of the input parameters. A PARAM byte is an input parameter of REQB and

WUPB commands.

Table 63 describes the ISO14443B_SetParamByte function.

Table 63.

ISO14443B_SetParamByte function description

Table 62.

ISO14443B_ProtocolSelect function description

Prototype

int8_t ISO14443B_ProtocolSelect (uc8TxDataRate,

uc8 RxDataRate, uint8_t*pResponse);

Input parameter

TxDataRate: Transmission data rate (2 bits)

RxDataRate: Reception data rate (2 bits)

Output parameter

pResponse: Pointer to the CR95HF response

Return parameter

RESULTOK: Function is successful.The ISO14443-4 Type B protocol is

selected.

ISO14443B_ERRORCODE_PARAMETER: One parameter is incorrect.

CR95HF_ERROR_CODE: Function failed. The ISO 14443_4 Type B

protocol is not selected.

Prototype

int8_t ISO14443B_SetParamByte(uc8ExtendedBit,

uc8 REQBWUPBbit, uc8NumberOfSlots);

Input parameter

ExtendedBit: Indicates the PCD capability to support an extended ATQB

response.

REQBWUPBbit: This bit defines either REQB (0) or WUPB (1).

NumberOfSlots: Number of slots

Output parameter

None

Return parameter

PARAM: PARAM byte

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