AS3911 datasheet(63/149 Pages) AMSCO

63 / 149 page

ams Datasheet, Confidential: 2013-Oct [2-03]

AS3911 – 63

Appl icatio n I n f o rm a t i o n

IO Configuration Register 1

Figure 40:

IO Configuration Register 1

Note:

Default setting is set at power-up only.

Address 00h: IO Configuration Register 1

Type: RW

Bit

Name

Default

Function

Comments

7single

1: Only one RFO driver will be

used

Choose between single and

differential driving of antenna

6rfo2

0: RFO1, RFI1

1: RFO2, RFI2

Choose which output driver and

which input will be used in case of

single driving

5fifo_lr

0: 64

1: 80

FIFO water level for receive

4fifo_lt

0: 32

1: 16

FIFO water level for transmit

3osc

0: 13.56 MHz Xtal

1: 27.12 MHz Xtal

Selector for crystal oscillator

Use of VHBR is only possible with

27.12 MHz Xtal

out_cl1

out_cl

MCU_CL

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

0lf_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.

AS3911 Datasheet(PDF) 63 Page - ams AG

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