Interfacing of Microprocessor Unit III - EC2304 MPMC Question

1.        Give the Salient features of 8253 timer module

2.        What is an sample and hold circuit

3.        List out the major function performed by CRT interface

4.        List out the four display modes of 8279 keyboard /display controller

5.        What are the commonly used ADC and DAC ‘s?

6.        Formulate the control word for setting bit PC4 high using BSR mode

7.        What is the purpose of AC flag available in Intel processors?

8.        What is key bouncing?

9.        Write down the control word format of SCON and TMOD Register

10.  Determine the control word for the following configuration of 8255:- Port A – Output

Mode of port A – Mode 1

Port B – Output

Mode of port B – Mode 0

Port C lower (pins PC0 – PC2) – Output

11.  What   is   8254?      Discuss   its   various   operating   modes.   What   are   its   areas   of applications?

12.  What is interfacing?

13.  List the operating modes of the 8255A programmable device.

14.     What is the internal frequency of the 8279? How can you drive from any available clock signal?

Part B

1. 1.   Explain the 8279 keyboard and display controller with neat sketch.
2. 2.   Describe the architecture and working of 8253 timer and also explain the various operating modes
3. 3.   With diagram, explain the operation of R-2R method of D/A Converter
4. 4.    Explain the function of CRT terminal interface