8051 PORTS

The open drain bidirectional (input or output) port without internal pullups is

• Port 0

• Port 1

• Port 2

• Port 3

When the port lines of a port are to be used as input lines then the value that must be written to the port address is

• F0H

• 0FH

• FFH

• 00H

Total number of I/O port pin of 8051 Microcontroller is

• 24 pins

• 32 pins

• 33 pins

• 40 pins

8051 has _______parallel ports

• 3

• 2

• 0

• 4

The I/O ports that are used as address and data for external memory are

• port 0 and port 2

• port 0 and port 3

• port 1 and port 3

• port 0 and port 3

An alternate function of port 3.4 in 8051 is ______

• Timer 0

• Timer 1

• Interrupt 0

• Interrupt 1

Alternate function of Port 3.0 in 8051 is ________

• Serial output

• Serial Input

• Interrupt 0

• Interrupt 1

Which port does have maximum number of alternate functions

• port 0

• port 1

• port 2

• port 3