# Interruptions help

**URL:** <https://forum.kirupa.com/t/interruptions-help/271895>\
**Category:** Uncategorized\
**Created:** [September 30, 2008, 4:08am UTC](https://forum.kirupa.com/t/interruptions-help/271895 "2008-09-30T04:08:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![wo1olf](https://avatars.discourse-cdn.com/v4/letter/w/278dde/32.png) [@wo1olf](https://forum.kirupa.com/u/wo1olf)\
**Post date:** [September 30, 2008, 4:08am UTC](https://forum.kirupa.com/t/interruptions-help/271895/1 "2008-09-30T04:08:36Z")

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Basicaly i have this code that handle a del light. To change the state of the del i use an interruption. But the thing is no matter if i press the button to turn off the light it does not work.  
I think that may be it is due to the way i initiate the interruption.  
here the code

```auto

ISR(INT0_vect)
{
 // here i put the code to change the state, it is just an if else 
 
}

```

i have to use MCUCR register does any one know how it works? i mean if i need to assign it a value what is the best way to do it?