Without knowing how much including that resistor increases the probability that the resonator will oscillate it's hard to calculate if it's even worth bothering. I think it's similar to straying above the guaranteed speed limit of the processor.
Acceptable accuracy, cheap price($0.32 per 100), fewer parts(no Caps needed)Chuck.
Wow, those HC49's are big. The resonators I use are 3.5 x 1.5 x0.6mm. Those HC49's are 11.5 x 4.7 x 3.5mm, bigger than the 328 TQFP! Chuck.
...for a hobbiest there is no reason to use an inaccurate and thermally unstable ceramic resonator in lieu of a real crystal.
There are several picofarads of capacitance on the PC board and traces... I can't see how 20-some pF more is important.
ceramic startup vs quartz is minor compared to internal osc which is fastest of all. comments that they are cheaper are way off too (unless you are digi-sparky-mouser fanboy) so really little reason to go there. imo choosing ceramic for original pro-mini just one of the several examples of incompetent design. some uno too. fortunately chinese clones switched to quartz along with a few other corrections.
Maybe you can contact Atmel and do all of us a service by making sure they correct the errors in their documentation regarding this.
Whoa... don't get me started on that topic!
Consider, though, things like the pin spacing goof that has been perpetuated throughout all the Arduino boards
not to mention the mounting holes which, by their placement and lack of a "keep-out" zone for the traces, are 98% useless.
For example, why are maybe 6 bits out of an 8 bit port connected to one contiguous connector space and the other two somewhere else? Makes it a mess to use as an 8 bit PARALLEL port.
And, pin numbers! Why "Pin 13"?
I want to know what PORT and what BIT the pin is, not have to constantly bring up the PDF of the board to find out which pin is what (you'd think I would have it memorised by now).
And, why "pinMode" and "digitalRead/Write"? What's wrong with PORTB |= _BV (5);
When something is dumbed-down to the lowest common denominator, nobody LEARNS anything.
Maybe AFTER you can explain to me why my boards (both Arduino and homebrew) all work fine WITHOUT caps....
Maybe AFTER you can explain to me why my boards (both Arduino and homebrew) all work fine WITHOUT caps.... In fact, can you find anyone who has a board that will FAIL without caps?