ST25R3911B datasheet(55/116 Pages) STMICROELECTRONICS

Part #	ST25R3911B

Description	High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT

PDF	116 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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55 / 116 page

1.3.1

IO configuration register 1

Address: 00h

Type: RW

Table 19. IO configuration register 1

Bit

Name

Default

Function

Comments(1)

single

1: Only one RFO driver will be used Choose between single and differential antenna driving

rfo2

0: RFO1, RFI1

1: RFO2, RFI2

Choose which output driver and which input will be used in case of single

driving

fifo_lr

0: 64

1: 80

FIFO water level for receive

fifo_lt

0: 32

1: 16

FIFO water level for transmit

osc

0: 13.56 MHz Xtal

1: 27.12 MHz Xtal

Selector for crystal oscillator

out_cl1

out_cl0

MCU_CLK

Selection of clock frequency on MCU_CLK output in case Xtal oscillator is

running. In case of “11” MCU_CLK output is permanently low.

3.39 MHz

6.78 MHz

out_cl0

13.56 MHz

disabled

lf_clk_off

1: No LF clock on MCU_CLK

By default the 32 kHz LF clock is present on MCU_CLK output when Xtal

oscillator is not running and the MCU_CLK output is not disabled.

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

ST25R3911B

Registers

DS11793 - Rev 6

page 55/116

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