8255 PPI

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

• RESET

• A1

• WR(ACTIVE LOW)

• All of the mentioned

The strobed input/output mode is another name of

• mode 0

• mode 1

• mode 2

• none

How many pins does the 8255 PPI IC contains?

• 24

• 20

• 40

• 32

In which mode do all the Ports of the 8255 PPI work as Input-Output units for data transfer?

• BSR mode

• Mode 0 of I/O mode

• Mode 1 of I/O mode

• Mode 2 of I/O mode

How many bits of data can be transferred between the 8255 PPI and the interfaced device at a time? or What is the size of internal bus of the 8255 PPI?

• 16 bits

• 12 bits

• 8 bits

• None of the above

Which port of the 8255 PPI is capable of performing the handshaking function with the interfaced devices?

• Port A

• Port B

• Port C

• All of the above

In mode 2 of I/O mode, which of the following ports are capable of transferring the data in both the directions?

• Port A

• Port B

• Port C

• All of the above

How many ports 8255A has?

• 2

• 3

• 4

• 5

In BSR mode, only port C can be used to

• set individual ports

• reset individual ports

• set and reset individual ports

• programmable I/O ports