RX95HF datasheet(18/44 Pages) STMICROELECTRONICS

18 / 44 page

Commands

RX95HF

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DocID023884 Rev 3

After reception of the LISTEN command and the return of a ‘No error’ confirmation, the

RX95HF enters Listening mode. The host controller has to use SPI Poll mode or IRQ_OUT

pin to detect when a receive frame is available in the RX95HF buffer. The RX95HF will exit

Listening mode as soon it receives the ECHO command (0x55) from the Host Controller

(MCU) or a command from an external reader (not including commands supported by the

ACFILTER command listed in Table 29).

In all cases, the RX95HF will send data or an error code to the Host controller (MCU).

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

command, the RX95HF sends 0x55 + 0x8500 (error code of the Listening state cancelled by

the MCU).

Possible return codes are listed in Table 13.

RX95HF to

Host

Error code

0x8200

: Invalid command length

Length of data

RX95HF to

Host

Error code

0x8300

: Invalid protocol or protocol is

not supported.

Length of data

RX95HF to

Host

Error code

0x8F00

: No field. Command cannot be

executed because there is no external

field.

Length of data

Table 13. Response codes from the RX95HF in Listening mode

Direction

Data

Comments

Example

RX95HF to

Host

Result code

<<<0x8005E050BCA508

The request from the Reader is

decoded. This is an example of a

response in ISO/IEC 14443 Type A

protocol.

<Len>

Length of data

<Data>

Data received.

Interpretation depends on

protocol

RX95HF to

Host

Error code

<<<0x8500

Listening mode was

cancelled by the application

Length of data

RX95HF to

Host

Error code

<<<0x8600

Communication error

Length of data

RX95HF to

Host

Error code

<<<0x8800

Invalid SOF

Length of data

RX95HF to

Host

Error code

<<<0x8900

Receive buffer overflow

(too many bytes received)

Length of data

RX95HF to

Host

Error code

<<<0x8A00

Framing error (start bit=0,

stop bit=1)

Length of data

Table 12. LISTEN command description (continued)

Direction

Data

Comments

Example

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