ST25R3910 datasheet(43/65 Pages) STMICROELECTRONICS

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ST25R3910

1.3.7

Receiver Configuration Register

Address: 06h

Type: RW

Table 14. Receiver Configuration Register(1)

Bit

Name

Default

Function

Comments

agc_en

1: AGC enabled

AGC operation mode

agc_m

1: AGC operates on first eight subcarrier pulses

0: AGC operates during the whole receive period

5rg2

rg2

rg1

rg0

Gain reduction

Gain reduction from 0 to 21 db,

in 3 db steps

rg1

000

3rg0

3 db

21 db

fs2

fs1

fs0

Filter

selection(2)

Comments

Filter selection is automatically set

when ISO mode or receive data rate

changes (change of ISO Mode

Definition Register). After automatic

preset filter, selection can be changed

by writing these bits.

fs1

000

ISO-14443A

106 kbps

Automatic

preset

fs0

001

ISO-14443B

106 kbps

010

ISO-14443A/B

212 kbps

011

ISO-14443A/B

424 kbps

100

ISO-14443A/B

848 kbps

110

424/848 kHz

subcarriers

No automatic

preset

111

212 kHz

subcarrier

Other combinations not supported, or used for

block testing purposes

1. Default setting takes place at power-up and after Set Default command.

2. Filter selection bits are preset also when ISO mode or receive data rate change.

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