In message <12D4B324.5AB8@cc.usu.edu>, Ken Dougal writes >Could someone clue me in on whether or not I need to use capacitors with >a 16 Mhz crystal that I'm using with a 16c55. I'm not using the watch >dog timer or anything fancy, just doing I/O stuff. > >The MicroChip databook says I ought to use 2 47uf caps. Examples in the >Easy PIC'n book don't show capacitors. I'm using the type of crystal >that's in a metal can, with four leads, one not connected, one +5v, one >GND and the last one is the signal. > >I've used MPLab to program, debugged it and the program works great in >the MPLab environment but I put it in the circuit and it doesn't appear >to be running. I've made sure I selected all the appropriate options >both in MPLab and in burning in the chip. > >Any help would be greatly appreciated, >Ken Dougal >slm5g@cc.usu.edu You seem to be using a DIL *oscillator* module, *not* a crystal. You just connect the oscillator output to the CLKIN pin on the PIC, and leave the CLKOUT pin unconnected. You don't use any capacitors. Leon -- Leon Heller Amateur radio callsign: G1HSM Email: leon@lfheller.demon.co.uk http://www.lfheller.demon.co.uk Tel: +44 (0) 118 947 1424 (home) +44 (0) 1344 385556 (work)