Em 7/11/2011 15:18, Electron escreveu: > 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 7.372= 8 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) Beware, many PLLs accept the input frequency only in a very narrow band (say, 4MHz to 8MHz). If your crystal frequency divided by the input divider is outside this range, the PLL may not work. Isaac --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .