AS3911 datasheet(47/159 Pages) AMSCO

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[v2-11] 2016-Jun-13

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AS3911 − Application Information

Figure 35:

SPI Read Timing

Interrupt Interface

There are three interrupt registers implemented in the AS3911

(Main Interrupt Register and auxiliary Timer and NFC Interrupt

Interrupt Register contains information about six interrupt

sources, while two bits reference to interrupt sources detailed

in Timer and NFC Interrupt Register and Error and Wake-Up

Interrupt Register.

When an interrupt condition is met the source of interrupt bit

is set in the Main Interrupt Register and the IRQ pin transitions

to high.

The microcontroller then reads the Main Interrupt Register to

distinguish between different interrupt sources. The interrupt

registers 0x17, 0x18 and 0x19 are to be read in one attempt. Its

content is reset to 0. Exceptions to this rule are the bits pointing

to auxiliary registers. These bits are only cleared when

corresponding auxiliary register is read. IRQ pin transitions to

low after the interrupt bit(s) which caused its transition to high

has been read. Please note that there may be more than one

interrupt bits set in case the microcontroller did not

immediately read the interrupt registers after the IRQ signal was

set and another event causing interrupt occurred. In that case

the IRQ pin transitions to low after the last bit which caused

interrupt is read.

In case an interrupt from a certain source is not required it can

be disabled by setting corresponding bit in the Mask Interrupt

registers. In case of masking a certain interrupt source the

interrupt is not produced, but the source of interrupt bit is still

set in interrupt registers.

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DA T A I

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DA T A O

tDO D

tDO H Z

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MO S I

MIS O

SC L K

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