Determine the Source of Interrupt

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

A processing unit reads its interrupt status (ISR) and mask (IMR) registers to determine the source that caused the IRQ interrupt. Once serviced, the ISR can be cleared by writing the data that was read from this register. The bits that were set are cleared while preserving any bits that got set after the read took place, which helps to eliminate missed interrupts.