RX95HF Datasheet, PDF (18/44 Pages) STMicroelectronics – Near field communication transceiver for tag emulation

Commands
RX95HF
Direction
RX95HF to
Host
RX95HF to
Host
Table 12. LISTEN command description (continued)
Data
Comments
Example
82
Error code
0x8200: Invalid command length
00
Length of data
83
Error code
0x8300: Invalid protocol or protocol is
00
Length of data
not supported.
RX95HF to ^8F
Host
00
Error code
Length of data
0x8F00: No field. Command cannot be
executed because there is no external
field.
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.
Table 13. Response codes from the RX95HF in Listening mode
Direction
Data
Comments
Example
80
RX95HF to
Host
<Len>
<Data>
Result code
Length of data
Data received.
Interpretation depends on
protocol
<<<0x8005E050BCA508
The request from the Reader is
decoded. This is an example of a
response in ISO/IEC 14443 Type A
protocol.
RX95HF to ⁸⁵
Host
00
RX95HF to ⁸⁶
Host
00
Error code
Length of data
Error code
Length of data
<<<0x8500 Listening mode was
cancelled by the application
<<<0x8600 Communication error
RX95HF to ⁸⁸
Host
00
RX95HF to ⁸⁹
Host
00
RX95HF to ^8A
Host
00
Error code
Length of data
Error code
Length of data
Error code
Length of data
<<<0x8800 Invalid SOF
<<<0x8900 Receive buffer overflow
(too many bytes received)
<<<0x8A00 Framing error (start bit=0,
stop bit=1)
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