>> about asynchronous interrupt. You said to me that the 18's family
>> has 2 levels of interrupt, but unfortunately, there is a bug with
>> that feature which have been fixed very recently.
....
>> there a hope you can sell me one or two 18F452 without the bug.

>your best options are:
>
>1  -  Figure out how to use a single interrupt priority level.
>
>2  -  Use one of the newer 18F parts that doesn't have the interrupt
>priority bug.  However beware that some of these have other problems in
>that they don't work at the full specified speed.  I consider the =
18F1320,
>for example, to be a 20MHz device until Microchip fixes this problem.

One good possibility is the 18F458.
It should be pin compatible, just don't enable the CAN port.
I am using these successfully at 39.3216 Mhz. Haven't tried 40 yet.

I have seen no mention of either the interrupt priority bug or a
clock speed bug in the errata sheet for this chip (80134C.pdf)

These chips should be available from the usual places.
Digi-Key currently has DIP,PLCC, and TQFP packages in stock for
singles pricing from $10.30 to $11.53 depending on package.

Good Luck
Lyle

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