Vasile Surducan wrote:
> On 8/28/06, Richard Prosser <rhprosser@gmail.com> wrote:
>   
>> 3.6864MHz can be useful for the 4MHz devices if you don't want to overclock
>>
>>     
>
> I didn't found -till now- any 4MHz PIC device (running at 5V) which
> can't run OK at 7.3728MHz.
> More than that, the last test with F parts (16F88, 16F628) supplied at
> 3V, shows there is no problem even with clock of 14.7456MHz (at least
> on that simple application I'm using: RF detectors, ADC, external I2c
> eeprom, RS232 serial communication)
>
>   
Agreed. I have run many 20M PICs at 28.8M (twice video clock) without 
any problem, although the
aluminum header type always worked, some ceramic headers (eraseable 'C' 
parts) were cranky.

You had to DRIVE the PIC, of course, the OSC won't run that fast.

--Bob

> greetings,
> Vasile
>   

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