AS3911 datasheet(48/149 Pages) AMSCO

48 / 149 page

AS3911 – 48

ams Datasheet, Confidential: 2013-Oct [2-03]

A p pl i c at io n I n f o r m at i o n

Direct Commands

Figure 34:

List of Direct Commands

Command

Code

(hex)

Command

Comments

Command

Chaining

Interrupt

after

Termination

Operation

Mode (1)

Set Default

Puts the AS3911 in default

state

(same as after power-up)

all

C2, C3

Clear

Stops all activities and

clears FIFO

Yes

Transmit With CRC

Starts a transmit sequence

using automatic CRC

generation

Yes

en, tx_en

Transmit Without

CRC

Starts a transmit sequence

without automatic CRC

generation

Yes

en, tx_en

Transmit REQA

Transmits REQA command

(ISO14443A mode only)

Yes

en, tx_en

Transmit WUPA

Transmits WUPA command

(ISO14443A mode only)

Yes

en, tx_en

NFC Initial Field

Performs Initial RF Collision

avoidance and switch on

the field

Yes

en (9)

NFC Response

Field ON

Performs Response RF

Collision avoidance and

switch on the field

Yes

en (9)

NFC Response

Field ON with n=0

Performs Response RF

Collision avoidance with

n=0 and switch on the field

Yes

en (9)

Go to Normal NFC

Mode

Accepted in NFCIP-1 active

communication bit rate

detection mode

Yes

Analog Preset

Presets Rx and Tx

configuration based on

state of Mode Definition

Definition Register

Yes

all

Mask Receive

Data

Receive after this

command is ignored

Yes

en, rx_en

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