ST95HF datasheet(50/93 Pages) STMICROELECTRONICS

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Commands

ST95HF

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DocID025630 Rev 4

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

card 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 ST95HF 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 ST95HF buffer before being read by the external microcontroller to perform Level 4 of

the ISO/IEC 14443 Type A protocol.

The ST95HF is able to interpret and respond to the commands listed in the table below. The

device remains in Listening mode after executing these commands.

ST95HF to

Host

Result code

AC Filter is successfully activated.

<<<0x0000

AC Filter is successfully deactivated

(LEN = 0x00).

<<<0x0001XX0000

(where XX is ST

Reserved)

Length of data

ST95HF to

Host

Error code

<<<0x8200

Invalid command length

Length of data

Table 41. ST95HF state when behaving as ISO/IEC 14443-A tag

Value

AC state

0x00

Idle

0x01

ReadyA

0x02

ReadyB

0x03

ReadyC

0x04

Active

0x80

Halt

0x81

ReadyAX

0x82

ReadyBX

0x83

ReadyCX

0x84

ActiveX

Table 42. 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

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

Direction

Data

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