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Posted By: kondapalli Member Level: Gold Posted Date: 08 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Electrical and Electronics Engineering INTERFACING THROUGH MICROPROCESSORS setno4 Question paper
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1. (a) With the examples explain the functioning of instruction pointer and stack
pointer in 8086 microprocessor.
(b) How many status flags does 8086 have? Discuss the role of each flag. [8+8]
2. Develop an 8086 assembly language program that converts the given hexadecimal
data into ASCII and vice-versa. [16]
3. (a) Write short notes on the following string data transfer instructions :
i. LODS
ii. STOS
iii. MOVS
(b) Explain what the REPE prefix does when coupled with the SCASB instruction
? [12+4]
4. (a) Suppose that the beginning address of an 8255 is 0500 and write a program
sequence that will
i. Put both groups A and B in mode 0 with ports A and C being input ports
and port B as an output port.
ii. Put group A in mode 1 with port A being an input and PC6 and PC7
being outputs and group B in mode 1 with port B being an input.
(b) Explain interfacing I/O subsystem using an 8255 with one example. [8+8]
5. (a) What is minimum no. of bus cycles that can occur between the time an
interrupt request is recognized and the first instruction in the interrupt routine
is fetched. Draw the bys cycles.
(b) Write an instruction sequence that will cause the priority of an 8259, whose
even address is
08A0, to be IR4, IR5, IR6, IR7, IR0, IR1, IR2, IR3. Solve this twice, once
assuming that the
highest priority is currently IR0 and once assuming that it is IR3. [6+10]
6. (a) Design a circuit to activate a actuator, based on a bit combination given by
eight switches interfaced to a microprocessor
(b) Design a interface circuit to feed numbers 0-9 through a linearly encoded
switches and to display the number on a seven segment LED through a mi-
croprocessor [8+8]
7. (a) Explain how characters are displayed on CRT screen
(b) Explain in detail how CRT controller can be interfaced to Microprocessor.
[4+12]
8. Describe how an assembly language program is developed and debugged using sys-
tem tools. [16]
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