I am planning to use a PC18F2455 for RS232. To help save cost and reduce complexity, I want to use the internal oscillator. However, I'm concerned about baud rate error. We'll be operating at 9600 8N1 and 5V signal levels. Can someone point me to documentation that discusses using the internal oscillator with RS232. I've searched for an application note, but haven't found one. Please go easy on me, as I =20 have never used this forum before and don't even know if it is going =20 to get through. Thanks, Steven --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .