Well, yes and no. As stated on the list before, all PICs are "born" equal.
But the 10 and 20 MHz parts undergo tests at higher clock frequencies to
make _sure_ they will work at 10 or 20 MHz. Experience shows that even -04
parts will often work with high frequency clock, but it is not guarateed.
For one off project it is OK to use the cheaper parts at higher clock rate,
for mass production the little saving is probably not worth the service
hassle with not functioning or returned units. The same principle applies
for the low power and industrial temperature range.
Josef
{Quote hidden}>Nope.
>
>The frequency of the resonator/crystal must be LESS THAN or EQUAL TO the
>frequency of the PIC (the latter is an upper limit). 20% overrun is
>acceptable, though (at your own risk).
>
>Imre
>
>
>On Tue, 25 Aug 1998, John Haggins wrote:
>
>> Ralph,
>>
>> Can I use a 10Mhz resonator/crystal with a 4Mhz PIC ?
>> Or must the frequencies match?
>>
>> Thanks
>> John
