ia3513 integration, ia3513 Datasheet - Page 28

• Manufacturer Part Number: ia3513
• Description: Headset Voice And Power Solution
• Manufacturer: integration

IA3513
Application Example 4 – Interruption Notification, Dual Registers
Interrupt sources must be detected from the two possible interrupt handling registers (register 10, and register 11) thus, it is
recommended that the host determines the source of the generated interrupt by doing a burst read on both registers
simultaneously.
Supposing that after reading these registers, the host detects an ET (“End of Tone”) interruption, and a GPIO2 interruption, the
best way to acknowledge them is by doing a burst write, clearing bit ET on register 10 and clearing bits INT and GPS2 on register
11. Care should be taken not to clear the bit INT on register 10 also, because on doing so a pulse on GPIO5 would be generated
at the end of the register 10 data word (since the GPS2 was not yet acknowledged).
The following diagram illustrates what happens in the case that a new interrupt is generated on GPIO3, before the ISR
acknowledges the previously detected sources (during the previous read).
This next diagram shows what happens, when acknowledging the interrupts on ET, and GPS3, if there are no more pending
interrupts.
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