AN3955 datasheet(46/68 Pages) STMICROELECTRONICS

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ISO/IEC 14443-3 layers

AN3955

46/68

Doc ID 022017 Rev 1

The ISO14443B_SplitProtocolInfoField function splits the ProtocolInfo field. The

ProtocolInfo field is a part of ATQB response. Table 71 describes the

ISO14443B_SplitProtocolInfoField

function.

Table 71.

ISO14443B_SplitProtocolInfoField function description

Prototype

int8_t ISO14443B_SplitProtocolInfoField(uc8*Pr

otocolInfoField,

uint8_t*BitRateCapability,uint8_t*MaxFrameSize

,uint8*ProtocolType, uint8_t*FWIbits,

uint8_t*ADCbits, uint8_t*FObits,

uint8_t*SFGIbits, uint8_t*RFUbits);

Input parameter

ProtocolInfoField: Protocol info field (part of ATQB response, 4bytes)

Output parameter

BitRateCapability: Bite rate supported by the contactless tag (8 bit)

MaxFrameSize: Max frame size (4bit)

ProtocolType: (4 bit) b1=1 compliant with 14443_4 b1=0 not

compliant with 14443_4. b2&b3 minimum TR2 coding b4: RFU

FWIbits: Frame waiting time integer (4 bit)

ADCbits: Application data coding (2bit).

0b00: application is proprietary

0b01: application is coded (refer to ISO/IEC 14443-3, RFU

specification)

FObits: Frame option (2bit)

0b1X: NAD suported x1b

0bX1: CID supported

SFGIbits: SFGI bits (4 bit). Optional, depending on Extended ATQB

supported bit. Refer to Table 64: ISO14443B_REQB function

description.

RFUbits: RFU bits (4bit). Optional, depending on Extended ATQB

supported bit. Refer to Table 64: ISO14443B_REQB function

description.

Return parameter

RESULTOK: Function is successful.

CR95HF_ERROR_CODE: Function failed. The CR95HF returns an

error code.

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