ST95HF datasheet(49/93 Pages) STMICROELECTRONICS

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ST95HF

Commands

5.13

AcFilter command (0x0D) description

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

Table 39. SubFreqRes command description

Direction

Data

Comments

Example

Host to

ST95HF

0x0B

Command code

>>>0x0B00

0x00

Length of data

ST95HF to

Host

0x00

Result code

<<<0x00010F

In this example, 0x0F: is a frequency

divider. Use this value to configure the

ST95HF.

Subcarrier frequency is

0x01

Length of data

N, frequency divider

2 N 1

()

----------------------

Table 40. AC filter command description (Command <Len> > 0x02)

Direction

Data

Comments

Example

Host to

ST95HF

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 (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)

<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

(Mandatory)

UID for cascade level 2

(Optional)

UID for cascade level 3

(Optional)

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