Re: [avr-chat] (no subject)

[Clemens Koller]

Dharmesh Joshi schrieb:
> Dear Sir/Madam

Please don't post HTML on this list.

> I would like to know how much voltage is outputted or inputted in to
> each Pins of the MEGA AVR. I have ordered the ATMEGA16V, which can run
> on 1.8V, but there is no info on the datasheets about the voltage of the
> I/O pins or how much power consumed.

I couldn't find a datasheet of the 16_V_ do you have one?
If you operate the AVR with VCC=1.8V then the pins are allowed to
become max. VCC+0.xVolts above VCC and GND-0.xVolts below GND
(the x is in the datasheet, abs. max. ratings).

> Am correct in believing there is a inbuilt oscillator, can this
> oscillator be controlled/reduced so that I can get a better power
> efficiency, or do I need to get a external oscillator and assign it a
> I/O pin.

I don't know how the internal osc. behaves. But external
crystals can be weakly driven for low power applications.
I.e. I have an 3.3V AVR and an external 11.0592MHz crystal.
The voltage swing on this crystal has only 1Vss but is still
working very reliable (verified with additional load).

Power consumption depends much on driving voltages and
freqencies. I've seen tons of graphs showing the power
consumption as a function of {MHz, V, Temperature, ...}

Regards,

Clemens Koller
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