Multiple Choice Questions on Microprocessors and Interfacing

Solapur University M.Sc (Semester IV) Paper March/ April 2019

Choose the correct option.
The 8255 is _________
(a) PPI device
(b) PIC device
(c) PIT device
(d) keyboard and display interface

Which pins are used as handshaking signals during mode-1 operation of the 8255 ?
(a) PA0-PA7
(b) PB0-PB7
(c) PC0-PC5
(d) PC6-PC7

How many IR lines can be able to connected to PIC 8259 in cascaded mode ?
(a) 08
(b) 16
(c) 32
(d) 64

8253, a programmable interval timer consists of ___________
(a) Three, 8-bit counters
(b) Two, 16-bit counters
(c) Three, 16-bit counters
(d) Two, 8-bit counters

In Memory mapped I/O; address width is ____________
(a) 8 bit
(b) 32 bit
(c) 16 bit
(d) 64 bit

The time taken by the ADC from the active edge of SOC (Start of conversion) pulse till the active edge of EOC (end of conversion) signal is called __________
(a) edge time
(b) conversion time
(c) delay time
(d) None of these

BSR mode of 8255 is used to set and reset the bits of ________
(a) PORT C
(b) PORT B
(c) PORT A
(d) All of these

The INTR is ________
(a) level triggered interrupt
(b) maskable interrupt
(c) lowest priority interrupt
(d) all of the above

The advantage of I/O mapped I/O over memory mapped I/O is, ___________
(a) Faster
(b) Many instructions supporting I/O mapped I/O
(c) Require a bigger address decoder
(d) All the above

The operation that can be performed on status word register is _________
(a) read operation
(b) wirte operation
(c) read and write operations
(d) None of these

Which of the following interrupt is non maskable ?
(a) INTR
(b) TRAP
(c) RST7.5
(d) RST6.5

Vector address of RST6.5 interrupt __________
(a) 0024H
(b) 002CH
(c) 0034H
(d) 003CH

Once the ICW1 is loaded, then the initialization procedure involves __________
(a) edge sense circuit is reset
(b) IMR is cleared
(c) slave mode address is set to 7
(d) all of the mentioned

In which mode of 8255, handshaking signals are not available ?
(a) Mode 0
(b) Mode 1
(c) Mode 2
(d) None of these