GPIO interrupts | Cypress Semiconductor
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Occasionally when constant GPIO interrupts occur, the CY3654 will halt. This has been found to happen most often at an 800Hz interrupt rate. The halt can happen anywhere from a couple of seconds to 10 minutes after the first GPIO interrupt.
This is a known problem with the CY3654. We're still investigating the cause. Please refer to the CY3654-P05 errata for a list of known issues. Open a support case for this document.