AVR-Chat

Thanks for the suggestions,

I mentioned that sometims it is working fine; starting
at 99 and counting down at 1 sec intervals, updating
display correctly. This indicates that initialization
is ok, lookup table, addressing is ok!

BUT SOMETIMES it gets this strange output on the seven
segment which is changing at 1 sec intervals. this
strange output is repeated every 10 sec, which appears
that the problem is in the reading data from lookup
table.

If it starts giving correct output it continues this
way, also if it starts giving strange output it
continues.

My question is:
1- Why is it sometimes working ok and stable and
sometimes not? if it is getting correct output code
why sometimes it is corrupted?

2- If a reset is done at the reset pin will it do a
complete reset? because what happens is that when it
gives strange output a reset brings it back to the
first corrupted displyed output not the 99 as it
should be.

I tried different chip and the same happened.

Moataz




--- David VanHorn <microbrix@gmail.com> wrote:

> Verify that when you load Z, it's actually pointing
> to twice the address of
> the table base, plus the proper offset?
> 
> Verify that you are picking up the data after the
> LPM instruction and not
> erasing it accidentally.
> 
> Check that you don't have an ISR that is killing the
> data.
> 
> 
> [Non-text portions of this message have been
> removed]
> 
> 




 
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