Debugger: Surprising values of cycle counts with and without interrupts

Code:



   // Test at UNO simulator

    delay(1000);     // around 16M cycle counts - almost correct

    noInterrupts();
    delay(1000);     // around 92500 cycle counts ?!?
    interrupts()



The value is never the same, though...

However, upper was quite a surprise! I'm not certain that is the bug in arduino code or simulator, though. Execution is 173 times faster when interrupts are disabled in simulator!

This is because delay() uses interrupts, so you can't use with interrupts disabled.