Re: OT AVR Flash


Mike Harrison wrote:
> On 28 Jan 2006 16:21:49 -0800, "linnix" <me@xxxxxxxxxxxxxxxxxx> wrote:
>
> >How reliable are the AVR's flash?
> >I have two Atmega169 (in AVR butterfly) failing.
> >They are supposed to last 10,000 cycles.
> >And yet, one failed after hundreds of cycles
> >and the second failed exactly after one cycle.
> >
> >I can't program either one of them anymore.
> >The first one refuse to verify and the second
> >one verified but still contain the previous version.
> >
> >If it's so difficult to program them, perhap I should
> >switch to PLCC (44 pins) socket rather than MLF (64 pins).
>
> Do you have an oscillator (resonator/xtal) connected ?
> If not, and you are relying on the internal RC oscillator, it can happen that the config fuses get
> corrupted during programming and it ends up in an external osc configuration, so you then can't
> reprogram it.
> This can be recovered by applying an extarnal clock signal (e.g. 1MHz) to the oscin pin and
> reprogramming the fuses to the desired INTOSC setting.

Yes, there is an external 32KHz crystal.
Programmings are successful, but verifications are
wrong in one case and mismatch in another.

.

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