AVR-Chat

Hi Richard,

The info your looking for is on page66 of the Mega32(L) Datasheet.

It was as I thaught, 2 watchdog oscillator cycles, which is dependent
on the voltage your running at, but should be easily under 6us. 

Cheers
Hein B
Auckland, New Zealand.

--- In AVR-Chat@yahoogroups.com, "Richard Cooke" <rcooke@...> wrote:
>
> Thanks for the info.  I'm planning on using an external interrupt to
> wake things up.  I just haven't been able to glean that info from
> their datasheets.
> 
> --- In AVR-Chat@yahoogroups.com, "kernels_nz" <hein@> wrote:
> >
> > Hi Richard,
> > 
> > How do you intend to wake up the MCU from Standby mode ? ie, dropping
> > reset low, external interrupt etc. I know that if you use an external
> > intterupt set to respond to a "low level" it takes 2 watchdog
> > oscillator cycles. a Hardware reset would be pretty much
> > instantaneous. I havent looked at the datasheet for the Mega32, but
> > have significant experience with Mega8 and 16. 
> > 
> > If it was critical, I would set a pin low, go to sleep, configure
> > things to wake up immediately after going to sleep, then set the pin
> > high. You can then use a good scope to have a look at the time taken.
> > This will give you a ballpark range, but youll need a pretty good
> > digital scope, preferrably with programmable trigger.
> > 
> > Cheers
> > Hein B
> > Auckland, New Zealand.
> > 
> > --- In AVR-Chat@yahoogroups.com, "Richard Cooke" <rcooke@> wrote:
> > >
> > > Hi Folks,
> > > 
> > > I've looked through the datasheet and I can't seem to find any
data on
> > > how long the chip takes to come out of standby.  I need to maximize
> > > battery life so I envision the chip to spend a lot of time in a
> > > power-saving mode but it needs to come back to life quickly.  Does
> > > anybody know where to find that info?  As an aside - the MSP430
> > > advertises it will wake-up in 6us.
> > > 
> > > Thanks,
> > > 
> > > Richard
> > >
> >
>