RX95HF Datasheet, PDF (27/44 Pages) STMicroelectronics – Near field communication transceiver for tag emulation

RX95HF
Commands
Table 28. RX95HF state
Tag
Emulation
state
ISO/IEC 14443 - 3 Type A
definition
Tag
Emulation
state
ISO/IEC 14443 - 3 Type A
definition
0x00
0x01
0x02
0x03
Idle
ReadyA
ReadyB
ReadyC
0x80
0x81
0x82
0x83
Halt
ReadyA* ⁽¹⁾
ReadyB* ⁽¹⁾
ReadyC* ⁽¹⁾
0x04
Active
1. After a ISO/IEC 14443 - 3 Type A WakeUp command.
The ACFILTER command activates or deactivates an anti-collision filter for ISO/IEC 14443A
tag protocol. This command also forces or indicates the Card Emulator state.
If the AC filter is not activated, all received commands are stored in the RX95HF buffer
before being read by the external microcontroller.
If the AC filter is activated, internal firmware will try to interpret the commands sent by the
reader itself and perform an anti-collision sequence. Non-interpreted commands are stored
in the RX95HF buffer before being read by the external microcontroller to perform Level 4 of
the ISO/IEC 14443 Type A protocol.
The RX95HF is able to interpret and respond to the commands listed in the table below. The
device remains in Listening mode after executing these commands.
Table 29. Commands to which the device is able to respond
Command
Code
Definition
SENS_REQ
26 (7-bit)
Sense request
ALL_REQ
SDD_REQ
SEL_REQ
52 (7-bit)
93, 95, 97
9370, 9570, 9770
WakeUp All request
Single device detection request
Select request
5.12
Echo command (0x55) description
The ECHO command verifies the possibility of communication between a Host and the
RX95HF. This command also can be used to exit Listening mode without an error when the
RX95HF has received a Listen command.
Direction
Host to RX95HF
RX95HF to Host
Table 30. ECHO command description
Data
Comments
Example
0x55 Command code
0x55 Code response
>>> 0x55: Sends an ECHO command
<<< 0x55: Response to an ECHO
command
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