8051 Features

8051 has ______ pins, ______ bits data bus and ______ bits address bus.

• 40, 8, 16

• 32, 16, 8

• 40, 16, 8

• 32, 8, 16

The capacity of _____ in 8051 is 4KB. (Multiple answers may be chosen)

• RAM

• Data Memory

• ROM

• Code Memory

The capacity of program memory is ______

• 4 bytes

• 128 bytes

• 8 bits

• None of these

The banks are present in ______

• RAM

• ROM

• both RAM and ROM

• none of these

There are ______ parallel ports in 8051.

• 4

• 8

• 1

• 2

The serial port in 8051 is ________

• full duplex

• half duplex

• simplex

• none of these

The timers in 8051 are of _____ .

• 8 bits

• 32 bits

• 4 bits

• 16 bits

If /EA pin = 0, it means _____

• external code memory will be accessed.

• external data memory will be accessed.

• internal code memory will be accessed.

• internal data memory will be accessed.

/PSEN pin is used for _______

• reading from external ROM

• reading from external RAM

• reading from internal ROM

• reading from internal RAM

ALE pin is used for _________

• de-multiplexing address and data bus

• multiplexing address and data bus

• de-multiplexing address bus

• multiplexing data bus