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Interrupt | Cypress Semiconductor


Last Updated: 
Jan 28, 2021


  • Defines hardware-triggered interrupts
  • Provides a software method to pend interrupt
Symbol Diagram

Symbol isr_1 Diagram

General Description

The Interrupt component defines hardware triggered interrupts. It is an integral part of the Interrupt Design-Wide Resource system (see PSoC Creator Help, Design-Wide Resources section).

There are three types of system interrupt waveforms that can be processed by the interrupt controller:

  • Level – IRQ source is sticky and remains active until firmware clears the source of the request with an action (for example clear on read). Most fixed-function peripherals have level-sensitive interrupts, including the UDB FIFOs and status registers.
  • Pulse – Ideally, a pulse IRQ is a single bus clock, which logs a pending action and ensures that the ISR action is only executed once. No firmware action to the peripheral is required.
  • Edge – An arbitrary synchronous waveform is the input to an edge-detect circuit and the positive edge of that waveform becomes a synchronous one-cycle pulse (Pulse mode).
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