ST25R3911B datasheet(94/129 Pages) STMICROELECTRONICS

Part #	ST25R3911B

Description	Automatic antenna tuning system providing tuning of antenna LC tank

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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94 / 129 page

ST25R3911B

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DocID029656 Rev 2

1.3.25

Timer and NFC Interrupt Register

Address: 18h

Type: R

Table 50. Timer and NFC Interrupt Register(1)(2)

Bit

Name

Default

Function

Comments

7

I_dct

-

IRQ due to termination of direct

command

-

6I_nre

-

IRQ due to No-Response Timer

expire

-

5

I_gpe

-

IRQ due to general purpose

timer expire

-

4

I_eon

-

IRQ due to detection of external

field higher than Target

activation level

-

3

I_eof

-

IRQ due to detection of external

field drop below Target activation

level

-

2

I_cac

-

IRQ due to detection of collision

during RF Collision Avoidance

An external field was detected during RF

Collision Avoidance

1I_cat

-

IRQ after minimum guard time

expire

An external field was not detected during RF

Collision Avoidance, field was switched on, IRQ

is sent after minimum guard time according to

NFCIP-1

0

I_nfct

-

IRQ when in target mode the

initiator bit rate was recognized

-

1. At power-up and after Set Default command content of this register is set to 0.

2. After Main Interrupt Register has been read, its content is set to 0.

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