On 09-Jan-02 Byron A Jeff wrote: > Reread the subject. He's talking about a 16F84A, which does go up to 20Mhz. Well in my defence I would quote this from the original post.... "The manual for the PIC16F84 shows crystal for up to 10MHZ" so I assumed that was the part he was using (since he had actually got the manual for it) rather than the "A" mentioned in the subject line :-) The 84 to 84A migration note is also rather unhelpful in that it just says "you'll have to try it and adjust the capacitor if it doesn't work right" > My answer is that the cap values are not as critical as you think. 15-30pF > have worked fine with all the PIC based 20 Mhz crystal projects that I've > done. I would imagine the oscilator circuit in the 84A is similar to the one used in other newer 20Mhz parts (eg 16F627) so as your experience shows 15-30pF would seem correct. Peter. ---------------------------------- E-Mail: Peter Onion Date: 09-Jan-02 Time: 15:02:38 This message was sent by XFMail ---------------------------------- -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.