When using ICD2 and dsPIC30F2010, I cannot see data that has been put into the U1TXREG. In the following code, I can see the hex 49 go into W0 while single stepping but U1TXREG never changes. I have read the ICD2 docs and cannot find any reason for this. Any explanations? Mov.b #0x49, W0 Mov W0, U1TXREG -- Regards, Stephen D. Barnes -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist