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Re: [avr-chat] (no subject)

From: David VanHorn
Subject: Re: [avr-chat] (no subject)
Date: Thu, 29 Nov 2007 14:40:08 -0500

> 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.

The I/O pins are driven from the AVR's power supply, so it will never
QUITE reach the voltage applied on the VCC pin, and it will be less
with a large load.
Generally speaking, microcontroller I/O pins are not designed to drive
much more than 1-2 mA
For your 1.8V VCC, you might see 1.8V or slightly less.

> 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.

There is an internal RC at 1 MHz, you can apply external clock or
crystal/resonator to the X1 and X2 pins

> Thank You
> Yours Sincerely
>  Dharmesh Joshi
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