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Synchronous:

The synchronous format, receiver or transmitters are synchronized. A block of information is transmitted along with the synchronization information. This is clk oriented transmission format. This information is specially used for high speed transmission. Usually in this synchronous system one or two SYNC character are used for data synchronous data system. Transmission device send data continuously to receiving device. If the data is not ready this system continuously synchronous data until the data is unviable.

Asynchronous:

It is character oriented. Each character comes with the information of start and stop. In this system 1 for mark, 0 for space. When data are being transmitted a receiver stay at high at logic 1. This is specially used in low speed transmission.

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Q: Difference between synchronous and Asynchronous serial communication in micro controller?
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