Fundamentals of 8085 microprocessor — DU B. Sc. (Hons) Electronics Previous Year Question Papers

(c) Define what a I-state is and explain how it contributes to an instruction cycle with an example. 6. (a) What are the different registers in 8085 (b) Describe the purpose of the CALL and RET instructions. How are they used in subroutine handling? (6) (c) What are branch instructions in the 8085 microprocessor? Explain the difference between conditional and unconditional branching with examples. (6) 7. (a) Write an assembly language program to add two 8-bit numbers stored at memory locations 2050H and 2051H, and store the result at 2052H. (6) (b) Develop an assembly language program to find the 1's complement of an 8-bit number stored in the accumulator. (6) 1. (a) What is a microcontroller, and how is it different from a microprocessor? (3) (b) What is the function of the accumulator? (3) (c) Explain the use of the NOP instruction in the (d) What is an addressing mode? Name any three addressing modes used in the 8085 microprocessor. (e) What is a stack pointer? (3) 2. (a) Describe the basic block diagram of a microprocessor system, explaining the function of each main component. (6) (b) Perform the following arithmetic operations : (i) Add binary numbers 1011 and 1101. (ii) Subtract hexadecimal numbers 1A from 2F. (iii) Find the 2's complement of the binary number 100110. (6) (c) Explain the role of the tri-state logic in microprocessors and how it facilitates data handling within a system. (6) (a) Represent the following signed decimal numbers in 8-bit binary using two's complement: (6) (b) Discuss how word size, speed, and memory capacity affect the performance of a microprocessor. (6) (c) Explain how assembly language interacts with the microprocessor and give an example of a basic assembly language instruction. (6) 4. (a) Why the program counter and the stack pointer are 16 bit registers? (6) (b) How many memory locations can be addressed by a microprocessor with 14 address lines? (6) (c) What are the externally initiated operation in 5. (a) Describe the structure of an 8085 instruction cycle. How is it divided into machine cycles and I-states? (6) (b) What is the significance of the timing diagram in the operation of the 8085 microprocessor? Illustrate with a simple example. (6)