ST95HF datasheet(27/93 Pages) STMICROELECTRONICS

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ST95HF

Commands

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 17.

Table 16. SENDRECV command description

Direction

Data

Comments

Example

Host to

ST95HF

0x04

Command code

See Table 17 and Table 26 for detailed

examples.

<Len>

Length of data

<Data>

Data to be sent

ST95HF 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

ST95HF to

Host

0x90

Result code

<<<0x90040x240000 (exception for

4-bit frames where ‘x’ represents ACK

or NAK value)

: Result code for “non-integer

number of bytes are received”

: total length of data

0A or 00: Data

: “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)

ST95HF to

Host

X0 + <Len> + Data (see Support of long frames on page 18)

ST95HF to

Host

0x86

Error code

<<<0x8600

Communication error

0x00

Length of data

ST95HF to

Host

0x87

Error code

<<<0x8700

Frame wait time out or no

tag

0x00

Length of data

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