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ran outta Interrupt enabled pin on KL25z

Topic last updated 12 Sep 2014, by Andy A. 1 reply
Nishant Sood
11 Sep 2014

AS the interrupts work only on the D and A ports of the KL25z ,is there any way out where I can get interrupts on my KL25z128VLK4?

Andy A
12 Sep 2014

Why do you need so many interrupts?

If this is for something like key press detection then you can run a loop on a timer interrupt that scans the keys. Technically slightly slower to detect a key press but fast enough that a person will never notice.

Or use diodes to OR all the signals together and feed them into a pin that is used to generate the interrupt, the software can then scan the individual inputs to determine what caused the interrupt.

Or use an external interrupt controller or IO expander.