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This question already has an answer here:

How can i use the attach interupt command and read rc channels in background. I am in doubt that attach interupt is only applied to 2 pins just and cant be used to get data from other pins.

marked as duplicate by Majenko, Nick Gammon, Ricardo, TheDoctor, CharlieHanson Oct 30 '15 at 17:19

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Please spell out what you mean by "rc channel"; eg add a link to a specification for rc channels. Note, the Uno has plenty of pin-change-interrupt pins, which can be used (eg) for software-serial i/o [with one software-serial channel active at once, in typical software-serial implementation] – James Waldby - jwpat7 Oct 12 '15 at 9:07
  • I mean external interupts,(radio control channels). – Bilal Ayub Oct 12 '15 at 9:11
  • You can use PCINTs. The only downside is that they all share one single interrupt routine (ISR). – Gerben Oct 12 '15 at 12:02
  • Bilal, please edit the question and spell out what you mean by "radio control channel". Is it an input? An output? Are you talking about controlling RC servos? Edit the question and add a link to an actual specification. – James Waldby - jwpat7 Oct 12 '15 at 14:52
  • I already tell you what you should investigate in your other question on the same topic. If you'd read the entire answer there you would know the answer to this question already. – Majenko Oct 12 '15 at 15:57
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I am not sure what you are asking but you can have as many interrupt sources on a single interrupt pin as you want. When the interrupt happens in your ISR (Interrupt Service Routine) you simply check each one and process the ones that are valid. Be sure to do one final check before exiting as another could happen while servicing the first one.

Gil

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