RX95HF Datasheet, PDF (25/44 Pages) STMicroelectronics – Near field communication transceiver for tag emulation

RX95HF
Commands
5.11
AcFilter command (0x0D) description
This command activates/deactivates the anti-collision filter in Type A Tag Emulation mode.
The following tables define the command and response fields depending on the AC filter
command length.
Table 24. AC filter command description (Command <Len> > 0x02)
Direction
Data
Comments
Example
Host to
RX95HF
0D
Command code
<Len>
Length of data
<ATQA>
(2 bytes)
Unused and proprietary
bits of SAK (protocol bits
will be handled by
firmware)
<SAK>
Unused and proprietary
bits of SAK (protocol bits
will be handled by
firmware)
UID for cascade level 1
<UID part 1> _(Mandatory)
UID for cascade level 2
<UID part 2> _(Optional)
UID for cascade level 3
<UID part 3> _(Optional)
General case (LEN 0x00, 0x01 or
0x02)
>>>0D0B440320880251744AEF2280
Activate filter for 2-cascade anti-collision
Note that the command length can be 7,
11 or 15 bytes depending on UID length:
7: for 1-cascade level filter
11: for 2-cascade levels filter
15: for 3-cascade levels filter
All other values greater than 2 will result
in an ‘Invalid command length’ error.
Values 0, 1 and 2 are defined in the
following tables.
*** Special cases of command ***
LEN = 0x00
>>>0x0D00 De-activate AC Filter (LEN
= 0x00)
<<< 0x0001XX0000 AC Filter is
successfully deactivated (XX: Table 28)
LEN = 0x01
>>>0x0D01XX - Set AC state (see table
below)
<<< 0x0000 AC state successfully set
LEN = 0x02
>>> 0x0D020000 - Returns AC state
without deactivating filter
<<< 0x0001XX AC state (XX: Table 28)
00
RX95HF to
Host
00
Result code
Length of data
AC Filter is successfully activated.
<<<0x0000
AC Filter is successfully deactivated
(LEN = 0x00).
<<<0x0001XX0000 (where XX is ST
Reserved)
RX95HF to ⁸²
Host
00
Error code
Length of data
<<<0x8200
Invalid command length
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