Try to setup PTC18 as input, and causing interrupt at falling edge.
I am using PE to do setup, I can configure PTC18 as input, but I can't setup its interrupt at falling edge.
I assume you are using Kinetis/ARM?
There is the ExtInt (External Interrupt) component you could use.
Additionally, other settings for a pin like pull-up/pull-down/interrupt edges are defined in the Init_GPIO component.
Have a look at this article:
Tutorial: Bits and Pins with Kinetis and the FRDM-KL25Z Board | MCU on Eclipse
what chip do you work with?
Thanks. It is in Init_GPIO component.
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