AS3909 datasheet(34/77 Pages) AMSCO

34 / 77 page

AS3909/AS3910 – 34

ams Datasheet, Confidential: 2013-Oct [3-02]

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

Transparent Mode

Enter in the Transparent mode. The Transparent mode is

entered on the falling edge of signal SEN and is maintained as

long as signal SEN is kept low. See “Transparent Mode” on

page 66 for details about the Transparent Mode.

This command is only accepted when the Transmitter and

Receiver are operating.

Registers

The 6 bit register addresses below are defined in the

hexadecimal notation. The possible address range is from

00(hex) to 3F(hex). A sign # before a number is used in this

document to reference a hexadecimal number.

There are two types of registers implemented in the AS3909/10:

configuration registers and display registers. The configuration

registers are used to configure the AS3909/10. They can be

written and read through the SPI (RW). The display registers are

read only (RO); they contain information about the AS3909/10

internal state which can be accessed through the SPI.

Main Registers

Figure 22:

ISO Mode Definition Register

Address # 00: ISO Mode Definition Register

Type: RW

Bit

Name

Def.

Function

Comments

nfc

1=NFC, 0=ISO-14443

NFC means NFCIP-1,

106 kbps active communication

mode

b_a

1=ISO-14443B, 0=ISO-14443A

Applicable in case nfc=0

5tx_rate2

tx_rate2

tx_rate1

tx_rate0

bit rate

Selects ISO-14443 data rate for

transmit, Applicable in case

nfc=0

4tx_rate1

106kb/s

3tx_rate0

212kb/s

424kb/s

848kb/s

RFU

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