At 11.45 2005.05.17 -0700, you wrote:
>I've noticed that the smaller 18F parts are rated at 40 MHz, but the
>larger ones are not. My guess is that the larger ones have more
>peripherals hanging on the internal bus, making it hard to move the bus
>that fast.

I think you are right but ONLY about quantity of Flash memory. Not about
peripherals. Look, for example, at 18F8520 vs 18F8720. 40 MHz vs 25 MHz,
all the rest is 100% the same.


>Does my guess sound reasonable? When I first started with one
>of the big 18F chips, the datasheet said 40 MHz. My prototype worked, but
>production didn't. A piclist member pointed out an erratta dropping the
>clock speed to something like 25MHz.

The errata of the 18F8x20 says 4MHz, but that's another story. =:-0


>
>Harold


 
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