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

From: David Brown
Subject: Re: [avr-gcc-list] Volatile "Word" registers
Date: Tue, 28 Oct 2003 09:13:48 +0100

> 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



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