ST95HF datasheet(33/93 Pages) STMICROELECTRONICS

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ST95HF

Commands

The ECHO command (0x55) allows exiting Listening mode. In response to the ECHO

command, the ST95HF sends 0x55 + 0x8500 (error code of the Listening state cancelled by

the MCU).

Possible return codes are listed in Table 21.

If the request from the Reader was received and decoded correctly, the ST95HF will send

data back to the Host (Card Emulation application). This is explained in Table 22.

Table 21. Response codes from the ST95HF in Listening mode

Direction

Data

Comments

Example

ST95HF to

Host

Result code

<<<0x800605000071FF00

The request from the Reader is

decoded. This is an example of a

response in ISO/IEC 14443 Type B

protocol.

<Len>

Length of data

<Data>

Data received. Interpretation

depends on protocol

ST95HF to

Host

Error code

<<<0x8500

Listening mode was

cancelled by the application

Length of data

ST95HF to

Host

Error code

<<<0x8600

Communication error

Length of data

ST95HF to

Host

Error code

<<<0x8800

Invalid SOF

Length of data

ST95HF to

Host

Error code

<<<0x8900

Receive buffer overflow

(too many bytes received)

Length of data

ST95HF to

Host

Error code

<<<0x8A00

Framing error (start bit=0,

stop bit=1)

Length of data

ST95HF to

Host

Error code

<<<0x8B00

EGT time out (for

ISO/IEC 14443-B)

Length of data

ST95HF to

Host

Error code

<<<0x8D00

CRC error (Used in NFC

Forum Tag Type 3 protocol)

Length of data

ST95HF -

Host

Error code

<<<0x8E00

Reception lost without

EOF received

Length of data

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