hello . im using an Pic with an Xtal of 4Mhz and an delay routine that takes 4*250 cycles this is an delay of 1ms I measure these time and the output frequency is 625hz (1.6kHz) my anwers: could the Cext=22pF (Capacitor between xtal and gnd) be to low or is this a problem in my programm (i disabled Wdt / Gie)? __________________________________________________ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one place. Yahoo! Shopping: http://shopping.yahoo.com