Hello, I am working on two PIC16C63 projects. Both involve serial communication with other (Dallas) controller. Reception is interrupt driven (just one byte to receive). Both interrupt service routines are almost identical (interrupt enables, reception enables etc.) Nevertheless, while in one project communication is flawless, in other project reception stops at certain point and never happens again until program restarts (the rest of the program still working just fine). Will appreciate any advice. Gennady Palitsky gennadyp@mainlink.net