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Module 5: External Communication Interface

20202m

Which serial modes possess the potential to support the multi-processor type of communication?
(i) Modes 0 & 1
(ii) Modes 1 & 2
(iii) Modes 2 & 3
(iv) All of the above

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Answer: (iii) Modes 2 & 3

Explanation: 8051 serial modes 2 and 3 are 9-bit UART modes (1 start + 8 data + 1 programmable 9th bit + 1 stop = 11 bits) that support ** multiprocessor communication** using the 9th bit and SM2 feature to distinguish address vs data bytes. Mode 0 is shift register (synchronous) and Mode 1 is 8-bit UART (10 bits) - both lack the 9th bit mechanism for multiprocessor addressing. Hence only Modes 2 & 3 support multiprocessor communication.

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