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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