![]() The overhead of the stop and start bits can be eliminated or at least minimized by using synchronous transmission. While UARTs are available as an IC today, they are more likely to be integrated into an embedded controller or other IC. ![]() Control logic provides input and output control signals used in some protocols. The received byte is then transferred in parallel to the buffer and then to an external microcontroller or a PC. The start, stop, and parity bits are monitored and actions are taken accordingly. Received data comes in serially to the lower shift register. The UART is at the heart of most asynchronous interfaces.
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