Electron infinito.it> writes: > Thank you. How can I investigate if it's a PLL issue? I'm using a 7.3728 = MHz > crystal in XT mode and and PLLx16. The part can reach 30 MHz. Without knowing what part you are using, your crystal frequency X 16 >>>> 3= 0 MHz. Unless the crystal is divided before PLL, that would be a problem. =20 Sergey Dyrga http://beaglerobotics.com --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .