ST25R3920B datasheet(92/158 Pages) STMICROELECTRONICS

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Application information

ST25R3920B

92/158

DS13890 Rev 4

4.5.24

Timer and EMV control register

Address: 12h

Type: RW

Table 49. Timer and EMV control register

Bit

Name

Default

Function

Comments

gptc2

General purpose timer trigger source.

Refer to Table 50

gptc1

gptc0

4RFU

mrt_step

0: 64 / fc

1: 512 / fc

Mask receive timer step size

2nrt_nfc

0: NRT starts at end of TX (own field off)

1: NRT starts at peer field-on event

No-response timer start condition in AP2P

initiator and target mode.

nrt_emv

1: No-response timer EMV mode

0nrt_step

0: 64 / fc

1: 4096 / fc

No-response timer step size.

Table 50. Trigger sources

gptc2 gptc1 gptc0

Trigger source

The timer starts always with direct command Start General purpose timer.

No additional trigger source.

Additionally starts at End of RX (after EOF).

Additionally starts at Start of RX.

011

Additionally starts at End of TX.

In AP2P modes the timer is used to switch the field off.

In AP2P modes enables NRT start according to nrt_nfc description.

100

RFU

101

110

111

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