Programmable I/O Port 8255

Programmable peripheral input-output port is another name for

• serial input-output port

• parallel input-output port

• serial input port

• parallel output port

Port C of 8255 can function independently as

• input port

• output port

• either input or output ports

• both input and output ports

All the functions of the ports of 8255 are achieved by programming the bits of an internal register called

• data bus control

• read logic control

• control word register

• none of the mentioned

The data bus buffer is controlled by

• control word register

• read/write control logic

• data bus

• none of the mentioned

The input provided by the microprocessor to the read/write control logic of 8255 is

• RESET

• A1

• WR(ACTIVE LOW)

• All of the mentioned

The device that receives or transmits data upon the execution of input or output instructions by the microprocessor is

• control word register

• read/write control logic

• 3-state bidirectional buffer

• none of the mentioned

The port that is used for the generation of handshake lines in mode 1 or mode 2 is

• port A

• port B

• port C Lower

• port C Upper

If A1=0, A0=1 then the input read cycle is performed from

• port A to data bus

• port B to data bus

• port C to data bus

• CWR to data bus

The pin that clears the control word register of 8255 when enabled is

• CLEAR

• SET

• RESET

• CLK

In the I/O mode, the 8255 ports work as

• reset pins

• set pins

• programmable I/O ports

• only output ports