Microprocessor and Microcontroller — DU B.Sc. (Prog.) Physical Science courses pertaining to Electronics Previous Year Question Papers

(NEP: UGCF-2022) 3. Answer any three of the remaining four questions. (a) Specify the function of Address bus and the direction of information flow on address bus in 8085 Microprocessor. (b) While executing a program when 8085 MPU fetch the Machine code located at the memory location 2057H. What is the content of Program Counter of the fetch cycle? (c) Explain the importance of Accumulator in 8085 Microprocessor . (d) Differentiate between Maskable and Non Maskable Interrupts in 8085 (e) Give the size of RAM in each of the following Microcontrollers :- (f) Where does the 8051 wake up when it is Powered UP? 2. (a) Explain in brief what you understand by High level language and Low level languages. Also give the difference between Machine language and Assembly Language in 8085 Microprocessor with at least one example of cach. (5) (b) Explain the classification of Instructions in 8085 Microprocessor according to Word Size. (Give two examples of each). (6) (c) Explain what you understand by Stack? Explain briefly the instructions used to access them. (4) 3. (a) Draw labelled Functional block diagram of 8085 Microprocessor. (8) (b) Explain Demultiplexing of AD7 - ADO Bus with the help of schematic diagram of latching of low order Address bus. Explain the role of A2E signal. (7) 4 (a) Briefly explain the use of following Directives in 8051 Microcontroller: (i) EQU and (b) Write the Instructions to move value 34H into register A and value 3F H into register B then add the two numbers and store the result in memory location (c) Write a short note on Special Function Registers in 8051 Microcontrollers. 5. (a) In 8051 why do the instructions PUSH and POP in a subroutine need to be equal in number? What is the purpose of using PUSH and POP instruction in a subroutine. (4) (b) Explain bit addressability of ports of 8051 Microcontroller . (5) (c) Write a short note on ROM Memory space in 8051 Microcontroller. (6)