CS2252 - MICROPROCESSORS AND MICRO CONTROLLERS ANNA UNIVERSITY PREVIOUS YEAR QUESTION PAPER APRIL/MAY 2010

11. (a) (i) Write an 8085 assembly language program with flowchart for the following: Six bytes are stored in memory locations starting at XX50H. Add all the data bytes. Use register B to save any carry generated while adding the data bytes. Store the sum at two consecutive memory locations, XX70H and XX71H. Data (H): A2, FA, DF, E5, 98, 8B. (8 Marks)
(ii) Write a program to generate a continuous square wave with the period of 500 microseconds. Assume the system clock period is 325ns and use bit D0 to output the square wave. (8 Marks)
(Or)
(b) (i) Explain the following 8085 instructions with an example JP, JPO, CM, RPE, DAA, XCHG, SPHL and PCHL. (8 Marks)
(ii) Draw the timing diagram for the instruction MVI A, 32h and OUT 01h. (8 Marks)
12. (a) (i) Draw the internal block diagram of 8086 microprocessor and explain. (8 Marks)
(ii) Explain any eight assembler directives of 8086 microprocessor. (8 Marks)
(Or)
(b) (i) Give three exa mples for the following 8086 microprocessor instructions: String Instructions, Process Control Instruction, Program Execution Transfer Instructions and Bit manipulation Instructions. (12 Marks)
(ii)How does one define and call macro parameters of 886 microprocessor? (4 Marks)
13. (a) (i) Draw the internal block diagram of 8087 Co- processor and explain it with 8087 control word and status word formats. (12 Marks)
(ii) Give two examples for packed decimal data transfers and integer data transfers of an 8087 co- processor. (4 Marks)
(Or)
(b) Draw the architecture of 8089 I/O co- processor and explain. (16 Marks)
14. (a) Draw the block diagram of 8279 keyboard/ Display controller and explain hoe to interface the Hex Key pad and 7- segment LEDs using 8279. (16 Marks)
(Or)
(b) (i) Draw the functional block diagram of 8254 timer and explain the different modes of operation. (8 Marks)
(ii) Draw the block diagram of 8259A and explain ho w to program 8259A. (8 Marks)
15. (a) (i) Explain the memory structure of an 8051 Micro-controller. (8 Marks)
(ii) How does one interface a 16 X 2 LCD Display using 8051 Micro-controller? (8 Marks)
(Or)
(b) (i) Explain the on- chip timer modes of an 8051 Micro-controller. (8 Marks)
(ii) Explain how interface an 8- bit ADC with 8051 Micro-controller. (8 Marks)