I am developing some sort of multi controller device. It has two PIC microcontrollers (PIC18F4550 and PIC18F4680) can i use the USART for communication between the chips i.e. Can I just connect the RX of one chip to the TX of the other chip to do this? And can I use the serial data receive interrupt to read the data? At what maximum baud rate can i transfer the data? (The two microcontrollers just few centimeters apart as they are on the same board)