ST25R3916 datasheet(71/157 Pages) STMICROELECTRONICS

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DS12484 Rev 4

71/157

ST25R3916/7

Application information

156

4.5.1

IO configuration register 1

Address: 00h

Type: RW

Table 19. IO configuration register 1

Bit

Name

Default

Function

Comments

7single

0: Differential antenna driving

1: Only one RFO driver will be used

Chooses between single and

differential antenna driving.

6rfo2

0: RFO1, RFI1

1: RFO2, RFI2

Chooses which output driver and

which input will be used in case of

single driving.

i2c_thd1

I2C tHD: non hs-modes / hs-modes

00: 380 ns / 160 ns

01: 180 ns / 160 ns

10: 180 ns / 70 ns

11: 100 ns / 70 ns

i2c_thd0

3RFU

out_cl1

out_cl0

MCU_CLK

Selection of clock frequency on

MCU_CLK output in case Xtal

oscillator is running. With “11”

MCU_CLK output is permanently

low.

3.39 MHz

6.78 MHz

out_cl0

13.56 MHz

Disabled

lf_clk_off

0: LF clock on MCU_CLK

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.

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