ST25R95 datasheet(20/61 Pages) STMICROELECTRONICS

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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 16. List of <DATA> send values for the SendRecv command for

different protocols.

Note:

Before issuing a new SendRecv command, the previous one must be completed (for instance, either when a

response from the tag is received or when a timeout error or any other error response is received)

Table 15. SendRecv command description

Direction

Data

Comments

Example

Host to

ST25R95

0x04

Command code

See Table 16 and Table 17 for detailed examples.

<Len>

Length of data

<Data>

Data to be sent

ST25R95 to

Host

0x80

Result code

<<<0x800F5077FE01B3000000000071718EBA00

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

ST25R95 to

Host

0x90

Result code

<<<

0x90040x240000 (exception for 4-bit frames where ‘x’ represents

ACK or NAK value)

•

90: Result code for “non-integer number of bytes are received”

•

04: total length of data

•

0A or 00: Data

24: “2” means no CRC, “4” means 4 significant bits in

Data byte.

•

00 00: No collision in response

Example ACK

<<< 0x90040A240000

Example NAK

<<<

0x900400240000

<Len>

Length of data

ACK or

NAK

ISO 14443-A

ACK or NAK

detection

xx yy zz

3-byte response

flag analysis

xx: Error type and number of significant bits in first data byte

yy: First byte collision

zz: First bit collision(1)

ST25R95 to

Host

X0 + <Len> + Data (see Section 4.3 Support of long frames)

ST25R95 to

Host

0x86

Error code

<<<0x8600 Communication error

0x00

Length of data

ST25R95 to

Host

0x87

Error code

<<<0x8700 Frame wait time out or no tag

0x00

Length of data

ST25R95 to

Host

0x88

Error code

<<<0x8800 Invalid SOF

0x00

Length of data

ST25R95 to

Host

0x89

Error code

<<<0x8900 Receive buffer overflow (too many bytes received)

0x00

Length of data

ST25R95

Send receive (SendRecv) command (0x04) description

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