AVR-Chat

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
>