In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote: RS232 requires you stay within something like 3% of the oscillator frequency, the internal oscillator is rated at +/-7%. If you wan to use the interanl oscillar, synchronous serial will work in some cases.{shift in, shift out, SPI, I2C} ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=142883#m143155 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)