ST25R95 datasheet(41/61 Pages) STMICROELECTRONICS

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5.12

AC filter command (0x0D) description

This command activates/deactivates the anti-collision filter in Type A card emulation mode. The following tables

define the command and response fields depending on the AC filter command length.

Table 39. AC filter command description (Command <Len> > 0x02)

Direction

Data

Comments

Example

Host to

ST25R95

Command code

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.

*** Special cases of command ***

LEN = 0x00

>>>0x0D00 De-activate AC Filter (LEN = 0x00)

<<<

0x0001XX0000 AC Filter is successfully deactivated (See Table 40. state

when behaving as ISO/IEC 14443-A tag

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 (See Table 40. state when behaving as ISO/IEC

14443-A tag)

<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

part 1>

UID for cascade

level 1

(Mandatory)

<UID

part 2>

UID for cascade

level 2 (Optional)

<UID

part 3>

UID for cascade

level 3 (Optional)

ST25R95

to Host

Result code

AC Filter is successfully activated.

<<<0x0000

Set State:

>>>>

0D0101

<<<<

0000

Length of data

ST25R95

to Host

Error code

<<<0x8200

Invalid command length

Length of data

ST25R95

to Host

Result code

Get state

>>>

0D020000

<<<

000101

Deactivate AC Filter:

>>>

0D00

<<<

000101

Length of data

<state>

AC state (See

Table 40. state

when behaving

as ISO/IEC

14443-A tag)

ST25R95

AC filter command (0x0D) description

DS12807 - Rev 4

page 41/61

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