On Wed, 3 Dec 1997 09:41:52 -0600, you wrote: >Are the 14000 and 12C50 the only PIC's that contain internal 4Mhz clocks? The 12C671/2 will - due about Feb 98 >And how acurate are they? I only know about the 12C508 - it seems pretty good, a few percent. Not as good as a ceramic res, but much better than an external RC - much better temp and voltage stability, and no problems with stray capacitance changes ____ ____ _/ L_/ Mike Harrison / White Wing Logic / wwl@netcomuk.co.uk _/ L_/ _/ W_/ Hardware & Software design / PCB Design / Consultancy _/ W_/ /_W_/ Industrial / Computer Peripherals / Hazardous Area /_W_/