STRFNFCA datasheet(44/74 Pages) STMICROELECTRONICS

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Commands

STRFNFCA

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Doc ID 023077 Rev 10

5.13

AcFilter command (0xOD) description

This command activates/deactivates the anti-collision filter in Type A Card Emulation mode.

The ACFILTER command activates or deactivates an anti-collision filter for ISO/IEC 14443A

card protocol.

If the filter is not activated, all received commands will be sent to external microcontroller.

If the filter is activated, internal firmware will try to interpret commands sent by the reader

itself and perform an anti-collision sequence. Data will not be sent to the external MCU

during anti-collision phase. It will only be sent when anti-collision is finished and STRFNFCA

is selected to perform Level 4 of ISO/IEC 14443 A protocol.

The STRFNFCA is able to interpret and respond to the following commands:

If the Len field is ‘1’, this function forces the STRFNFCA to enter to ‘Halt’ state. If Len is ‘0’,

this function returns the actual state.

Table 33.

Activate/deactivate anti-collision filter command description

Direction

Data

Comments

Example

Host to

STRFNFCA

Command code

>>>0x0D00

: deactivate filter

>>>0x0D0A00AA8804485BA1120000

Activate filter for 2-cascade anti-collision

Note that length can be:

7: for 1-cascade level filter

11: for 2-cascade levels filter

15: for 3-cascade levels filter

All other values will cause ‘Invalid

command length’ error.

<Len>

Length of data

<ATQA>

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

(Mandatory)

UID for cascade level 2

(Optional)

UID for cascade level 3

(Optional)

STRFNFCA

to Host

Result code

<<<0x0000

Filter is successfully

activated/deactivated

Length of data = 0

STRFNFCA

to Host

Error code

<<<0x8200

Invalid command length

<<<0x8300

Invalid protocol

Length of data

Table 34.

Commands to which 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

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