Hello.
I am using the Infineon XC167CI Microcontroller and I have a very important doubt about fast interruptions.
I want to combine two different inputs to manage the same interruption. I was thinking to use fast interruptions in a ANDed or ORed mode, but I don't know how I can use them exactly.
Is there any information about that or could anybody help me?
Best regards, willow.
I can confirm (at least on the board I have) that if you use DAvE with the settings you have listed it works as I would expect.
You need to remember the output of the OR gate is what will cause the interrupt (with the settings you have selected). So the two inputs of the OR gate are P2.8 and P1H.3 and you want an interrupt on any edge of the ORed result (the ORed output is what the XC167 will see and determine if an interrupt should be generated).
So if you look at a truth table for your case (rising/falling edge interrupts) and if we assume both inputs start at zero (logic 0):
P2.8 | P1H.3 | Out | status 0 | 0 | 0 | starting point (no transition, no interrupt) 0 | 1 | 1 | transition seen, interrupt yes 1 | 1 | 1 | no transition, interrupt no 1 | 0 | 1 | no transition, interrupt no 0 | 0 | 0 | transition seen, interrupt yes 1 | 0 | 1 | transition seen, interrupt yes 1 | 1 | 1 | no transition, interrupt no
Does this helps in your understanding?
-Chris
Hello Chris,
Thank you very much. It does help us.
We had a wrong idea on how it works, so we will have to change it but we now know how to do it.
Thanks again.