Hello, i have a little problem when i configure the external crystal of my ADuC7026. I do the following secuence: ----------------------------------------- volatile unsigned int dummy1, dummy2 dummy1=13; //all ok dummy2=15; //all ok PLLKEY1=0xAA; //all ok PLLCON=0x01; //all ok PLLKEY2=0x55; //<--- AFTER EXEC I GET ERROR dummy1=dummy1+dummy2; //do something dummy2=dummy1-dummy2; //to finish to write PLL -------------------------------------------- I get a JTAG communication error when i execute step by step and reach PLLKEY2=0x55. Can you help me? I tried to put JTAG speed to other values. Thanks.