Minimum Pulse Width to Generate a GPIO Interrupt in Port Expander
Last Updated: 12/14/2009
Question: What should be minimum pulse width on a GPIO for an interrupt event to be captured in Port Expander CY8C9560?
Response: The port expander firmware polls I/O pins and then sets register values and INT line status. The minimum pulse length that can be detected in this way should be greater than polling interval which is about ~4mS.