8051 I/O Ports

Identify the feature which is not relevant to the 8051 microcontroller.

• 8051 has two 8-bit timers for counting and timing operation.

• 8051 has 4 ports that are latched.

• 8051 supports interrupt and assigning priority to it.

• 8051 supports serial communication using TXD and RXD lines.

8051 is an 8-bit microcontroller. [True/False]

• True

• False

Identify the number of ports in 8051 microcontroller

• 2 ports

• 4 ports

• 1 port

• 8 ports

Indicate the purpose of program counter in 8051 microcontroller

• It holds the data to be written

• It holds the address of the next instruction to be fetched from the memory

• It points to the top of the stack

• It handles the interrupts

What is the size of internal ROM of the 8051 microcontroller.

• 40 K bytes

• 128 bytes

• 4 K bytes

• 80 K bytes

Identify the number of interrupts available in 8051 microcontroller

• 10

• 8

• 7

• 6

Predict the size of each timer in 8051.

• 8-bit

• 16-bit

• 32- bit

• 64-bit

Identify the input and output device

• LED and Switch- both output device

• LED- output device; Switch- input device

• LED- input device; Switch - output device

If LED connected to port in common anode configuration, what value should be sent to port to make LED glow (ON)

• logic 0

• logic 1

• either logic 0 or logic 1

If LED connected to port in common anode configuration, what value should be sent to port to make LED OFF.

• Logic 0

• logic 1

• either logic 0 or logic 1