At 03.52 2011.11.07, you wrote: >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 >>>> = 30 >MHz. Unless the crystal is divided before PLL, that would be a problem. = =20 This is a dsPIC30F2011, very basic PLL (x4 or x8 or x16) Greets, Mario --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .