Microcontroller and Applications - Dec 2012

Electronics Engineering (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 internal RAM memory organization of 8051 microcontroller(5 marks) 1 (b) Explain the CPSR register of ARM7 processor.(5 marks) 1 (c) Write a program for 8085 processor to convert two digit packed BCD number into unpacked BCD(5 marks) 1 (d) Explain the SP(bar)/ EN(bar) pin of 8259 interrupt controller. (5 marks) 2 (a) Design and explain two wait state generator circuitry which inserts two wait states in every OPCODE FETCH machine cycle(10 marks) 2 (b) Differentiate between I/O mapped I/O and memory mapped I/O. (10 marks) 3 (a) Design 8085 based system with following specifications
i) CPU operating at 3 MHz
ii) 16 KB program memory using 4 KB devices
iii) 4 KB data memory using 2 KB devices
iv) One 8 bit input and one 8 bit output port performing interrupt driven I/O data transfer in I/O mapped I/O mode.
Use exhaustive decoding approach. Give detailed I/O map and memory map and neat interfacing diagram (10 marks) 3 (b) Write 8085 based program to arrange ten data bytes in ascending order. Assume the data array begins from memory address 1000H onwards(10 marks) 4 (a) Explain Interrupt Enable and Interrupt Priority registers of 8051 microcontroller(10 marks) 4 (b) Explain Interrupt structure of 8085 processor(10 marks) 5 (a) Interface 0808 ADC to 8051 microcontroller and write a program to take in analog input connected to input channel 0 and send the converted digital data on LED's connected to P0. (10 marks) 5 (b) Explain Timer 0 internal structure in detail. (10 marks) 6 (a) Write 8051 based program to generate a delay of 100 msec if controller operates at 12 MHz crystal frequency. Show the delay calculations(10 marks) 6 (b) Explain MODE 0 and MODE 1 of 8253 Timer/Counter peripheral IC with the help of timing diagram(10 marks) 7 (a) Explain the instructions given below:
(i)ADDS r0, r2, r3
(ii)ADD r0, r0, r0 LSL #1
(iii)TST r0, r3
(iv) MVN r0, r2
(v)ORR r3, r2, # 1 < < 10
(10 marks) 7 (a) Explain the instructions given below:
(i)ADDS r0, r2, r3
(ii)ADD r0, r0, r0 LSL #1
(iii)TST r0, r3
(iv) MVN r0, r2
(v)ORR r3, r2, # 1 < < 10
(10 marks) 7 (b) Explain input data transfer using handshake signals of 8255 with the help of timing diagram(10 marks) 7 (b) Explain input data transfer using handshake signals of 8255 with the help of timing diagram(10 marks)