RX95HF datasheet(27/44 Pages) STMICROELECTRONICS

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RX95HF

Commands

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.

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.

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

Idle

0x80

Halt

0x01

ReadyA

0x81

ReadyA* (1)

1. After a ISO/IEC 14443 - 3 Type A WakeUp command.

0x02

ReadyB

0x82

ReadyB* (1)

0x03

ReadyC

0x83

ReadyC* (1)

0x04

Active

Table 29. Commands to which the device is able to respond

Command

Code

Definition

SENS_REQ

26 (7-bit)

Sense request

ALL_REQ

52 (7-bit)

WakeUp All request

SDD_REQ

93, 95, 97

Single device detection request

SEL_REQ

9370, 9570, 9770

Select request

Table 30. ECHO command description

Direction

Data

Comments

Example

Host to RX95HF

0x55

Command code

RX95HF to Host

0x55

Code response

>>> 0x55

: Sends an ECHO command

<<< 0x55

: Response to an ECHO

command

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