AS3911 datasheet(86/149 Pages) AMSCO

86 / 149 page

AS3911 – 86

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

A p pl i c at io n I n f o r m at i o n

Timer and NFC Interrupt Register

Figure 72:

Timer and NFC Interrupt Register

Note(s) and/or Footnote(s):

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

2. After Timer and NFC Interrupt Register has been read, its content is set to 0.

Address 18h: Timer and NFC Interrupt Register

Type: R

Bit

Name

Default

Function

Comments

7I_dct

IRQ due to termination of direct

command

6I_nre

IRQ due to No-response timer

expire

5I_gpe

IRQ due to general purpose

timer expire

4I_eon

IRQ due to detection of external

field higher than Target

activation level

3I_eof

IRQ due to detection of external

field drop below Target

activation level

2I_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

0I_nfct

IRQ when in target mode the

initiator bit rate was recognized

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