ST25R200 datasheet(28/88 Pages) STMICROELECTRONICS

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5.14.1

Operation register

Address: 00h

Type: RW

Domain: PD

Table 6. Operation register

Bit

Name

Default

Function

Comment

RFU

tx_en

1: Enables Tx operation

Enables field transmission

rx_en

1: Enables Rx operation

am_en

1: Enables AM regulator

RFU

en(1)

1: Enables ready mode (RD)

wu_en(1)

1: Enables wake-up mode (WU)

1. The transition between modes follows the sequence described in Section 5.1: Operating modes.

5.14.2

General configuration register

Address: 01h

Type: RW

Domain: PD

Table 7. General configuration register

Bit

Name

Default

Function

Comment

RFU

sink_mode

0: AM sink via main loop

1: AM sink via separate loop

single

0: Differential antenna driving

1: Single ended antenna driving

In the single ended, only one

RFO driver is used.

rfo2

0: RFO1, RFI1

1: RFO2, RFI2

When singe=1, defines the

RFO/RFI pair to use.

miso_pd2

1: Pull down on MISO, when BSS is low and MISO is not driven by

the device

miso_pd1

1: Pull down on MISO when BSS is high

RFU

reg_s

0: Regulated voltages are defined by the result of the adjustment of

the regulators command

1: Regulated voltages are defined by rege<4:0> bits

ST25R200

Application information

DS13658 - Rev 2

page 28/88

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