Thanks.
It explain compiller behavior and different mask then i set.
Dnia 29-06-2008 o godz. 0:12 Ruud Vlaming napisał(a):
> Hi
>
> If i try (changed your code a bit to make it compile)
> #define mbitPatternPowerMode (7<<2)
> #define mADCNoiseReduction 0x20
> #define mbitSleepMask 0x04
>
> void Test_MCUCR(void)
> {
> MCUCR=(MCUCR&(~mbitPatternPowerMode))|(mADCNoiseReduction|mbitSleepMask);
> }
>
> I get the same result. If you however try the same with
> #define mADCNoiseReduction 0x10
>
> You get 0xE3 as expected. The point is, defining mADCNoiseReduction
> with bit 5 set, it does not make a difference to the result if you
> use 0xC3 or 0xE5. So the compiler "optimized" it for you.
>
> greetings
> Ruud.
>
>
>
>
>
> On Saturday 28 June 2008 12:28, Arkadiusz Krysiak wrote:
> > can anyone explain that behavior?
> >
> > i have:
> > #define mbitPatternPowerMode=(7<<2);
> >
> > MCUCR=(MCUCR&(~mbitPatternPowerMode))|(mADCNoiseReduction|mbitSleepMask);
> >
> > and i get before compilation:
> >
> > +00000088: B785 IN R24,0x35 In from I/O location
> > +00000089: 7C83 ANDI R24,0xC3 Logical AND with
> > immediate
> > ; ^^^^ bad value i expect 0xE3
> > instead of 0xC3 :O
> >
> > +0000008A: 6284 ORI R24,0x24 Logical OR with
> > immediate
> > +0000008B: BF85 OUT 0x35,R24 Out to I/O location
> >
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