malfunction of atmel avr mega overclocked at 25mhz.
0:00-0:35 = clocked at 25Mhz not working corectly
0:35-0:49 = working corectly at 25Mhz
1:05-1:23 = original frequency
malfunction of atmel avr mega overclocked at 25mhz.
0:00-0:35 = clocked at 25Mhz not working corectly 0:35-0:49 = working corectly at 25Mhz 1:05-1:23 = original frequency
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I've overclocked some avrs to 27MHz, M32, M16, M8 and only M8 has crashed twice doing some complicated math. And it was no matter if i put 18 or 33pF caps, or even without caps - working good. But i you want to enable CKOPT fusebit for rail-to-rail you must put some caps. Have not yet tried how it will work with f generator but i guess it will be better than with crystal.
Ok so CPU rated for 16mhz, working with my caps 100% stable at 20mhz and maulfunting at 25mhz (56% overclocking) is just because everything else, you are sure that the reason is not too high overclocking. I bet with good caps and fuse setting you could get it running at 250Mhz.
Some time ago I have tested it (with ATMega8): Some of them reach 25MHz, others don't. Maybe the AtMega88 goes higher(this chip is rated for 20MHz, the Mega8 only for 16MHz)
Perhaps try it with another AVR (of the same type of course). There are manufacturing tolerances. or increase the operating voltage a bit (max. to 6V) if you absolutely need the 25MHz clock.
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I think this is not a real malfunction. Filtering is essential on all circuits.
what's the long term effects of overclocking over the chip?