Microcontrollers and Applications - Dec 2013

Electronics & Telecomm. (Semester 5)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) Explain T-state, Machine cycle and Instruction cycles(5 marks) 1 (b) Why address and data bus are multiplexer? Explain how they demultiplexer in 8085(5 marks) 1 (c) Differentiate SJMP, AJMP and LJMP instructions of 8051(5 marks) 1 (d) Write assembly language program for 8051 to read the data from port lines P1.0 to P1.3 and P2.0 to P2.3, if data are equal then send FFH to PORT 3 else OOH(5 marks) 2 (a) Explain interrupt structure of 8085(10 marks) 2 (b) Explain internal memory organization of 8051 microcontroller(10 marks) 3 (a) Draw and explain timming diagram for instruction INR M(10 marks) 3 (b) Draw and explain the architecture of ARM processor (10 marks) 4 (a) Explain the control word register format of 8253. Write assembly language program for 8085 to generate a square wave frequency 2KHz using 8253. Assume 8253 clock frequency is 1 MHz(10 marks) 4 (b) Explain addressing modes of ARM processor(10 marks) 5 (a) Interface 8255 to 8085 using I/O mapped I/O technique. Write assembly language program to initialize 8255 as PORT A-input port, PORT B-output port in mode 1(10 marks) 5 (b) Calculate the time delay produced by the following subroutine. Assume crystal frequency of 8085 as 6 MHz
PUSH PSW
PUSH B
LXI B, FFFDH
UP : DCX B
MOV A,C
ORA B
JNZ UP
POP B
POP PSW
RET
(10 marks) 6 (a) Write assembly language program to generate a rectangular waveform of frequency 1 KHz and 70% duty cycle at pin P1.1 using 8051. Assume 8051 microcontroller is operating at frequency 12 MHz(10 marks) 6 (b) Explain serial communication in 8055 system(10 marks)

Write short note on :-

7 (a) Salient features of 89C51, 89C52, 89C2051, 89C2052(5 marks) 7 (b) ADC 0808 interfacing with 8051 microcontroller(5 marks) 7 (c) PORT 1 internal structure of 8051(5 marks) 7 (d) Memory Acess instructions of ARM processor(5 marks)