On Sat, 4 Oct 2003, Lucian wrote: > I do not use interrupts anymore, because I already have a timer interrupt activated, and i think it is interferring. Interrupts don't "interfere" with each other. > I would like to know if there can be a problem if there are activated the timer interrupts and the usart module interrupts Not from the PIC, if that's what you mean. > and if I can still check RCIF to see if there is something to receive, or how could i figure it out. You only need to check RCIF in your interrupt handler. It sounds like you have too much going on your code that you don't understand; I would suggest taking the advice others here have given and step back to a simpler example. An polled serial echo is very trivial to implement, and you can verify it by typing into your PC communications program; this also verifies your serial hardware and your UART settings. Then you can move to an interrupt-driven serial echo, then on to a buffered, interrupt-driven serial scheme. -- John W. Temples, III -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads