Hi, well i am using de ADuC7026 and have problems in configure the external clock. I can't debug if i put at the beginning of main(): // PLLKEY1=0xAA; // PLLCON=0x01; // PLLKEY2=0x55; // dummy1=27; // dummy2=14; // dummy1=dummy1+dummy2; and i need to use the external xtal because of precision. What am i doing wrong? I can't debug and uVision gets lots of errors like JTAG, dll cancelled.... I tried to run without debugging but the ADuC doesn't work well... i have 3 leds on I/O ports and at the beggining (in main) i turn on one, but sometimes when i reset de uC the all three turn on, and sometimes not.... so it doesn't do what i want. Can you please help me?