STRFNFCA datasheet(23/74 Pages) STMICROELECTRONICS

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STRFNFCA

Commands

Doc ID 023077 Rev 10

23/74

5.6

Send Receive (SendRecv) command (0x04) description

This command sends data to a contactless tag and receives its reply.

Before sending this command, the Host must first send the PROTOCOLSELECT command to

select an RF communication protocol.

If the tag response was received and decoded correctly, the <Data> field can contain

additional information which is protocol-specific. This is explained in Table 14.

Table 13.

SENDRECV

command description

Direction

Data

Comments

Example

Host to

STRFNFCA

0x04

Command code

See Table 14 and Table 15 for detailed

examples.

<Len>

Length of data

<Data>

Data to be sent

STRFNFCA

to Host

0x80

Result code

<<<0x800F5077FE01B30000000000

71718EBA00

The tag response is decoded. This is an

example of an ISO/IEC 14443 ATQB

response (Answer to Request Type B)

<Len>

Length of data

<Data>

Data received.

Interpretation depends on

protocol

STRFNFCA

to Host

0x90

Result code

<<<0x900400

Exception for 4-bit frames. This function

is limited.

ACK/NAK always returns ‘0’. (1)

0x04

Valid bits

ACK

or NAK

ISO 14443-A

ACK or NAK detection

STRFNFCA

to Host

0x86

Error code

<<<0x8600

Communication error

0x00

Length of data

STRFNFCA

to Host

0x87

Error code

<<<0x8700

Frame wait time out or no

tag

0x00

Length of data

STRFNFCA

to Host

0x88

Error code

<<<0x8800

Invalid SOF

0x00

Length of data

STRFNFCA

to Host

0x89

Error code

<<<0x8900

Receive buffer overflow

(too many bytes received)

0x00

Length of data

STRFNFCA

to Host

0x8A

Error code

<<<0x8A00

Framing error (start bit = 0,

stop bit = 1)

0x00

Length of data

STRFNFCA

to Host

0x8B

Error code

<<<0x8B00

EGT time out (for ISO/IEC

14443-B)

0x00

Length of data

STRFNFCA

to Host

0x8C

Error code

<<<0x8C00

Invalid length. Used in NFC

Forum Tag Type 3, when field Length <

0x00

Length of data

STRFNFCA

to Host

0x8D

Error code

<<<0x8D00

CRC error (Used in NFC

Forum Tag Type 3 protocol)

0x00

Length of data

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