Serial Communication Modes of 8051 - MCQs with Answers

Serial Communication Modes of 8051 - MCQs with Answers

Q1. Which two bits are supposed to be analyzed / tested for unity value (1) in SCON for the reception of byte in mode 1 serial communication ?

a. RI & TI
b. REN & RB8
c. RI & REN
d. TI & RB8

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Q2. What is the bit transmitting or receiving capability of mode 1 in serial communication?

a. 8 bits
b. 10 bits
c. 11 bits
d. 12 bits

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Q3. Which pin in the shift register mode (Mode 0) of serial communication allow the data transmission as well as reception ?

a. TXD
b. RXD
c. RB8
d. REN

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Q4. How is the baud rate determined on the basis of system clock frequency (f_sc) in accordance to mode '0' of serial communication?

a. (oscillator frequency) / 12
b. [2^SMOD / 32] x (oscillator frequency) / [12 x (256 – (TH1) ]
c. [2^SMOD / 64] x (oscillator frequency)
d. 2^SMOD / 32 x (Timer 1 overflow rate)

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