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AS3953

Datasheet - A pp l ic a t io n I n f or m a t i on

8.3.4 Display Registers

RFID Status Display Register.

Notes:

1. The information read from this register can be false during reception (the logic state change during reception and the readout of status

can be done just at the moment when the status is changing).

2. The RFID Status Display Register is not a real register. By reading this register, controller has access to specific RFID logic internal

signals in order to observe its internal state.

RATS Register.

Notes:

1. At power-up and after

Set Default, content of this register is set to ‘0’.

2. The RATS Register is used only in ISO 14443A-4 Protocol mode. It contains information sent by PCD in

RATS command. The register

informs the controller about maximum frame size that the PCD can handle and the attributed CID number.

Address# 04h : RFID Status Display

Type: R

Bit

Name

Function

Comments

7

hf_pon

1:

PICC AFE is active

AFE Power-on signal

6

state<2>

000:

POWER OFF

001:

IDLE

010:

READY 011 – ACTIVE

101:

HALT

110:

READYX

111:

ACTIVEX

100:

L4

PICC Logic state

5

state<1>

4

state<0>

3

RFU

2

RFU

1

RFU

0

RFU

Address# 05h : RATS

Type: R

Bit

Name

Function

Comments

7

fsdi3

RATS FSDI bits

Displays maximum frame size that PCD can

handle (set by PCD in

RATS command)

6

fsdi2

5

fsdi1

4

fsdi0

3

cid3

RATS CID bits

Displays attributed CID number (set by PCD

in

RATS command)

2

cid2

1

cid1

0

cid0