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Module 5: External Communication Interface

20212m

What is the bit transmitting or receiving capability of mode 1 in serial communication?
(i) 8 bits
(ii) 10 bits
(iii) 11 bits
(iv) 12 bits

Worked SolutionAI Assisted

Answer: (ii) 10 bits

Explanation: 8051 Serial Mode 1 is the 8-bit UART mode (variable baud rate using Timer 1). Frame format = 1 start bit + 8 data bits + 1 stop bit = 10 bits per character. This contrasts with Mode 0 (8 bits shift register), Mode 2 (11 bits: 1 start + 8 data + 1 programmable 9th +1 stop), Mode 3 (11 bits similar to Mode 2 but variable baud). Thus Mode 1 transmits/receives 10-bit frames.

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