Two Marks Questions with Answers

Two Marks Questions with Answers

 

Q.1 What are the modes of operations used in 8253 / 54 ?

Ans. : Each of the three counters of 8253 can be operated in one of the following six modes of operation.

1. Mode 0 (Interrupt on terminal count)

2. Mode 1 (Programmable monoshot)

3. Mode 2 (Rate generator)

4. Mode 3 (Square wave generator)

5. Mode 4 (Software triggered strobe)

6. Mode 5 (Hardware triggered strobe)

 

Q.2 What are the different types of write operations used in 82

Ans. : There are two types of write operations in 8253

1) Writing a control word register

2) Writing a count value into a count register     

 

Q.3 8253's out signal is to be used as a clock input of the desired frequency to a particular device. Is it possible ? How ?

Ans. : It is possible to use the out signal of 8253 as a clock input of the desired frequency to a particular device. Because we can program 8253 to generate continuous square wave signal of desired frequency on the out signal of it.

 

Q.4 What is the function of gate signal in 8252 timer ?

Ans. : The function of gate signal is to control the counter. Gate = 1 enables counting and Gate = 0 disables counting.

 

Q.5 Mention the applications of 8253.

Ans. : The applications of 8253 are :

 1. Clock generator

2. Pulse generator

3. Square wave generator

4. Programmable timer

5. Programmable counter

6. Rate generator

 

Q.6 What are different peripheral interfacing used with 8085 microprocessor ? AU : June-13

Ans. :

1. 8255 -  Programmable parallel interface.

2. 8279 – Keyboard / display interface.

3. 8251 – Universal synchronous / asynchronous receiver / transmitter interface.

4. 8259 – Programmable interrupt controller interface.

5. 8253 - Programmable timer interface.

6. 8257 – DMA interface.

 

 

University Questions with Answers (Long Answered Questions)

 

(Regulation 2008)

Dec.-11

Q.1 Draw the control word of 8253 timer/counter and explain. (Refer section 10.3)     [8]

Q.2 Draw the control word of 8253 timer/counter and explain the operating modes of 8253 timer/counter. (Refer sections 10.3 and 10.4)      [8]

Dec.-12

Q.3 Explain the different operating modes of 8253 timer. (Refer section 10.4) [8]

May-13

Q.4 Draw and explain the functional block diagram of 8253/54 timer. (Refer section 10.2)   [8]

Q.5 Draw and explain the functional block diagram of 8253 timer. (Refer section 10.2)        [8]

May-14

Q.6 Discuss the internal architecture of 8253 programmable interval timer. (Refer section 10.2)          [16]

(Regulation 2013)

Dec.-15

Q.7 Explain the block diagram and modes of the 8254 timer. (Refer sections 10.2 and 10.4) [8]

May-16

Q.8 Draw and explain the functional block diagram of 8254 timer. (Refer section 10.2) [8]

Dec.-16

Q.9 Explain the working of 8254 timer with a neat block diagram and its command word format. (Refer sections 10.2 and 10.3)       [8]

Dec.-17

Q.10 With necessary diagram, explain the different modes of operation of 8254, in detail. (Refer section 10.4)         [15]