pico:
I've got some atMega8L chips ordered I intend to run at 3.3V, 8MHz from the internal oscillator.I'm not intending to use the analog ADC, but the datasheet says I should supply power to AVcc as well as Vcc anyway.
Is there any need for any external components (e.g., caps) at all in this setup? I've seen some mega8 chips setup with small filter caps on AVcc and AREF to GND, but not sure if this will be beneficial at all if not using the ADC. The datasheet itself doesn't have anything definite to say on the matter AFAICT.
Atmel recommends a 220nF ceramic capacitor for decoupling and a 4.7k pullup resistor on RESET. That's it.
http://www.atmel.com/Images/doc0484.pdf
Bear in mind that the internal 8mHz clock rate varies with temperature/voltage. Timing won't be very accurate, serial comms won't work except at slow speeds.