Serial Communication in 8051

1. Which mode of serial communication is commonly used in 8051 microcontrollers?

• 1. Synchronous

• Asynchronous

• 1. Parallel

• 1. Both a and b

1. What is the primary purpose of the SCON register in 8051 microcontroller for serial communication?

• 1. Timer control

• 1. Interrupt control

• 1. Baud rate setting

• Serial mode setting

1. In 8051, which register is used to set the baud rate for serial communication?

• TH1

• SCON

• SBUF

• PCON

1. How many stop bits are commonly used in the 8051 serial communication?

• 1

• 0

• 2

• 1.5

1. What is the purpose of the TI (Transmit Interrupt) flag in the SCON register?

• 1. Indicates data reception

• 1. Indicates data transmission

• 1. Indicates parity error

• 1. Indicates frame error

1. Which pin of the 8051 is commonly used for serial data transmission?

• 1. P1.0

• 1. P1.1

• 1. P3.0

• 1. P3.1

1. What is the maximum baud rate that can be achieved using a standard 11.0592 MHz crystal in 8051?

• 1. 9600 bps

• 1. 19200 bps

• 4800bps

• 2400bps

1. Which of the following statements is true regarding the SBUF register in 8051 serial communication?
   

• 1. It is used for setting the baud rate

• 1. It is used for storing the data before transmission and after reception

• 1. It is used for configuring the serial port

• 1. It is used for controlling the stop bits

Which timer mode is used for baud rate setting?

• Timer 0 in mode 1

• Timer 0 in mode 2

• Timer 1 in mode 2

• Timer 1 in mode 1

Voltage level used by RS 232 is

• 0V for binary 0 &

  +5V for binary 1

• 0V for binary 1 &

  +5V for binary 0

• -12V for binary 1 &

  +12V for binary 0

• +12V for binary 1 &

  -12V for binary 0