Re: [avr-gcc-list] swap bits

[Klaus Rudolph]

Hi Marek,

a bit ago you answered:
> 
> > reverse_r16:
> >       out porta, r16
> >       in r16, portb
> 
> Wrong - one more word/cycle needed:
> 
>         out PORTA,r16
>         nop
>         in r16,PINB
> 
> Synchronization logic requires one cycle delay between "out" and "in"
> if we want to read the value just output, and not the previous one.
> 
I´ve read that in a datasheet, but can you give me a tip where this
topic is described
from atmel? I can´t find that anymore. Currently I play a bit with
simulavr
so that is a good time to think about that again.

Bye
        Klaus