CET Embedded Systems & Programming 3

Question 1

Which serial communication protocol uses separate MOSI, MISO, SCLK, and chip-select lines?

Accepted Answer

SPI

Answer

SPI (Serial Peripheral Interface) uses four dedicated lines: MOSI, MISO, SCLK, and one CS line per slave device.

Question 2

In I2C communication, what is the function of pull-up resistors on the SDA and SCL lines?

Accepted Answer

They pull the open-drain lines high when no device is driving them low

Answer

I2C uses open-drain outputs, so pull-up resistors are required to return the bus to a logic-high idle state when no device is asserting it low.

Question 3

What does 'baud rate' specify in a UART configuration?

Accepted Answer

The number of symbol transitions per second on the line

Answer

Baud rate is the number of signaling events (symbols) per second; in UART with binary signaling, it equals the bit rate.

Question 4

In SPI, which device generates the clock signal (SCLK)?

Accepted Answer

The master device exclusively

Answer

In SPI, only the master generates the clock; slaves synchronize data transmission and reception to this clock.

Question 5

What is the maximum number of devices addressable on a standard I2C bus using 7-bit addressing?

Accepted Answer

112

Answer

7-bit addressing provides 128 possible addresses, but 16 are reserved, leaving 112 usable addresses for slave devices.

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