> > I thought that one of the PICS had a UART built in but I can't find any. > Am I missing something or is there one that does RS232 using a built-in > UART? I do NOT want to do RS232 using PIC code - I want speed...!!! > 19200 full duplex in a PIC16C54HS running at 18.432 MHz with 2/3 of the CPU time left over. Could that be something..? The application note with the RS232 state machine is NOT the most efficient way to do a software UART. If I remember right it can do 9600 in a 20 MHz PIC but you will have no time left for other things. Let me know if you're interested! /Tomas Tomas Westlund OPQ Systems AB Sweden tomas@opq.se