μC detects transmission rate of RS-232 interface

摘要

RS-232 is the most common serial interface in the PC world. Most RS-232 interfaces communicate with the receiver at a fixed transmission rate, such as 9600 baud. But what happens if the transmitter operates with different transmission rates? Different transmission rates require the receiver to detect the rate and adjust the software to the new communication speed. The follow- ing description of how a receiver detects the transmission rate of an RS-232 interface does not describe the implementation of a receive-and-transmit routine.