ST25R3920 datasheet(70/152 Pages) STMICROELECTRONICS

70 / 152 page

Application information

ST25R3920

70/152

DS13261 Rev 9

4.5.3

Operation control register

Address: 02h

Type: RW

Table 19. Operation control register(1)

Bit

Name

Default

Function

Comments

7en

1: Enables oscillator and regulator

(Ready mode)

rx_en

1: Enables Rx operation

rx_chn

0: Both, AM and PM, channels

enabled

1: One channel enabled

If only one Rx channel is enabled, selection is

done by the Receiver configuration register 1 bit

ch_sel.

4rx_man

0: Automatic channel selection

1: Manual channel selection

If both Rx channels are enabled, chooses the

method of channel selection, manual selection is

done by the Receiver configuration register 1 bit

ch_sel.

tx_en

1: Enables Tx operation

This bit is automatically set by NFC Field ON

commands and reset in NFC active

communication modes after transmission is

finished.

1: Enables Wake-up mode

According to settings in Wake-up timer control

en_fd_c1

00: External field detector off.

01: Manually enable external field

detector with collision avoidance

detection threshold.

10: Manually enable external field

detector with peer detection

threshold.

11: Enable external field detector

automatically.

01: External field detector with collision

avoidance detection must be used in R/W mode

when using NFC field on commands.

11: External field detector with peer

detection/collision avoidance threshold activated

automatically must be used in NFCIP-1 active

communication (AP2P) and Passive target

modes.

en_fd_c<1:0> ≠ 0 and other bits in Operation

control register set to 0 put the device in Low

power initial NFC mode.

en_fd_c0

1. Default setting takes place at power-up only.

ST25R3920 Datasheet(PDF) 70 Page - STMicroelectronics

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