26-02-2013, 11:57 AM
EC 1362-MICROPROCESSORS AND MICROCONTROLLERS - QUESTION BANK
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UNIT-I
PART-A
1. What is the need for ALE signal in 8085 microprocessor?
2. How many machine cycles are needed to execute STA 1800?
3. What is the need for interfacing?
4. Compare memory mapped I/O and peripheral mapped I/O.
5. State the disadvantages of memory mapped I/O scheme.
6. What are the requirements to be met while interfacing I/O devices to
Microprocessor / microcontroller?
7. Define interfacing.
8. Show the common anode seven segments LED Configuration. How to switch it on
and off?
9. Differentiate between software and hardware interrupts.
10. What is interrupt?
11. Name the vectored and non vectored interrupt of 8085 system.
12. What do you mean by timing diagram?
13. Define i) Instruction cycle ii) Machine cycle
14. Define T-state and In which T-cycle the ALE signal is activated?
15. What do you mean by masking the interrupt? How it is activated in 8085?
16. If a 5 MHz crystal is connected with 8085; what is the value of system clock
frequency and one T state.
17. What is the function of SIM instruction in 8085?
18. What is the significance of I/O Ports?
19. What are the different machine cycles in 8085 Microprocessor?
20. How performance of a microprocessor is measured in terms of MIPS?
21. A microprocessor takes n μs is for executing as instruction. What design change will
make the microprocessor to execute the same instruction in n/2 μs?
PART-B
1. Describe the functional pin diagram of 8085. (16)
2. Describe the functional block diagram of 8085. (16)
3. Explain the 8085 interrupt system in detail. (16)
4. Explain various machine cycles supported by 8085. (16)
5. (i) With suitable examples explain how I/O devices are connected using
memory mapped I/O and peripheral I/O. (10)
(ii) Design a microprocessor system to interface an 8K × 8 EPROM and 8K × 8
RAM. (6)
6. Draw timing diagrams for the following instruction with appropriate control and
status signal. Explain in brief. CALL 2000 (16)
7. (i) Interface a 8KX8 EPROM IC and 2KX8 RAM IC with 8085 such that the
starting address assigned to them are 0000H and 4000H respectively using
address decoder having NAND gate and inverters (8)
(ii) Draw the timing diagram of I/O read cycle in 8085 and explain it (8)
8. Draw and explain the timing diagram of the following instructions of 8085
Microprocessor.
(i) LDA 2050H
(ii) RET (16)
9. With necessary diagrams, write short notes on the following
(i) RAM memory interfacing
(ii) ROM memory interfacing
(iii) Interrupt structure of 8085