Re: [avr-chat] Is it any method to avoid ADC start in idle mode?

[Dmitry K.]

On Saturday 03 June 2006 20:14, Rolf Magnus wrote:
> On Saturday 03 June 2006 07:51, Dmitry K. wrote:
[...]
> The datasheet says it quite clearly:
>
> "If the ADC is enabled, a conversion starts automatically when this mode is
> entered."

Alas, you are right.

> This doesn't depend on auto trigger source or the ADC interrupt settings.
> The solution is to simply switch the ADC off  (ADEN=0).

Unfortunately, thus the internal Vref is switched off (regardless
of ADMUX). At repeated inclusion, except for increased time of
conversion (25 steps), it is necessary to wait for transition
to a stady state an Vref voltage (with external capasitor) and
on additional schemes which use a Vref. 

> Well, you can use a timer as auto trigger source.

Yes, in result there is a mixture of unregular conversions.
And in case of period about 1.5 ... 2 of conversion time
the result is vary bad. (Delete 'sleep' --> all OK.)

Im am not understand Atmel's idea to merge Auto Trigger mode
with Auto Start for each 'sleep' instruction.

Thanks,
Dmitry.