Re: [Amforth] Watchdog prescalers

[Erich W. <ew....@na...>]

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Hi David,

On 10/12/2013 01:05 PM, David Wallis wrote:
>> Are you sure, you want to do this with the watchdog timer? Isn't the
>> watchdog timer only able to generate a reset?
> 
> 
> Thanks for your code Erich. I was keen to use the watchdog timer because it
> works with the lowest power mode (power down) and doesn't need external
> components.
> 
> It seems to be a fairly common method. The watchdog can either generate a
> reset or trigger an interrupt, or both. This interrupt can also be used as
> a wake up from power down. (At least on the 324P that I'm using).

"or an interrupt". Aha. Looking into the datasheets again:
atmega32 (the on I use most often): WDT generates a reset only.
atmega644p (of which I have some):  WDT generates an interrupt or a reset.

So I learned something. Thanks for enlightening me. :-)

> The other way I was considering was with timer 2 in synchronous mode (so I
> don't need external components) and use power save mode. Did you ever look
> at synchronous mode?

No, not yet. But maybe I should ...


Cheers,
Erich

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