Serial interface in 8051 has following serial communication mode:

2017

Answer: B. three full duplex asynchronous and one half duplex synchronous — The 8051 serial port has one synchronous shift-register mode and three asynchronous UART modes. The asynchronous modes are full duplex.

1. A.

   one full duplex synchronous and three half duplex asynchronous

2. B.

   three full duplex asynchronous and one half duplex synchronous

3. C.

   four asynchronous UART modes

4. D.

   four synchronous serial

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