Hi, all,

    I used a 4 Mhz (14,8,7,1) crystal can with a 16f84-04/P and experimented with a 74HC164. The result was displayed on a 7 segments LED. All goes well. But when I saw the over clocking postings, I tried to use a 6 Mhz can with no display. I then tried a 3.84Mhz, but the output was messed up. However, a 7.68Mhz and a 12Mhz crystal can worked well. What is the catch? Is the crystals at fault?

    I saw some schematic using a two leads crystal across the OSC1 and OSC2 pins of the PIC and then grounded both pins thru two 15pf Cap. Compare with the 14,8,7,1 can crystal, Which method is better?

    Thanks in advance.

Gary