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[Reply #15 on:]

Promini uses external 8 MHz oscillator, not internal.

[Reply #16 on:]

learn how to use fuses:

http://www.engbedded.com/fusecalc/

The 22pF caps on the crystal are important as they help crystal to oscillate on its fundamental frequency..

[Reply #17 on:]

So, the minimum circuit for an arduino based development board is a 16MHz crystal and the 100nF cap for power supply and pull up resistor for RESET pin ?

No, you can use the internal oscilator (there is a fuse). And the reset is not required. The minimum is just the cap for the supply

Why reset is not required ? I thought RESET should be pulled up for normal usage ?

Thanks

[Reply #18 on:]

Reset pullup needed for most stable operation, see Section 3

You are free to chase noise issue, odd resets, etc. if you so choose.

[Reply #19 on:]

Yea, so I neeed a pull up resistor

Thanks ^^