Re: [avr-gcc-list] Volatile "Word" registers

[David Brown]

> I saw this thread maybe a while back, but can't find references.. Is it
> "safe" in GCC to access 16-bit timer1 registers (OCR1A, etc.) as word-wide
> variables, or explicitly divide the operation into bytes.  I'm not worried
> about splitting accesses across an interrupt, etc. (this has to be managed
> either way), but I am worried about the compiler accessing the halves in
> proper order.  Looking at code, it *seems* to in the cases I see, but is
> this just happenstance or a feature of AVR-GCC?
>
> Thanks.
>

In short, yes it is safe.  I can't remember off hand the order you have to
use when reading or writing the 16-bit timers, but avrgcc knows and gets it
right.

mvh,

David