AVR-Chat

In mega16,I can read the GIFR register but I can't write to GIFR 
register(to write to external interrupt bits)and this instruction dont 
write to this register:
  out 0x3a,r24

--- In AVR-Chat@yahoogroups.com, "s_shahab_r" <s_shahab_r@...> wrote:
>
> In mega16,I can read the GIFR register but I can't write to GIFR 
> register(to write to external interrupt bits)and this instruction 
dont 
> write to this register:
>   out 0x3a,r24


Did you include the definition file?

The other thing is, writing 1's to the bits clears them.
You can't actually set the bits this way.

One of Dave's points, which may not be totally obvious, is
that you can't set an interrupt flag by software! Writing a
"1" to the bit resets it. You can learn this by reading the
appropriate parts of the description of the GFR (and other
registers containing interrupt flags) quite carefully,

Jim

On Tue, 07 Feb 2006 18:58:57 -0000
 "Dave VanHorn" <dvh@dvanhorn.org> wrote:
> --- In AVR-Chat@yahoogroups.com, "s_shahab_r"
> <s_shahab_r@...> wrote:
> >
> > In mega16,I can read the GIFR register but I can't
> write to GIFR 
> > register(to write to external interrupt bits)and this
> instruction 
> dont 
> > write to this register:
> >   out 0x3a,r24
> 
> 
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