STUPIDSID
Short Questions
1(a)
What is the use of bidirectional buffer in 8085?
1 M
1(b)
Define the function of parity flag in 8085.
1 M
1(c)
What is clock signal?
1 M
1(d)
Define machine cycle.
1 M
1(e)
Write instruction which rotate accumulator left with carry.
1 M
1(f)
What is the value of SP after execution of PUSH D instruction.
(SP=3000, DE=8050).
1 M
1(g)
What is direct addressing mode? Give an example.
1 M
1(h)
How many bytes instruction HLT has?
1 M
1(i)
How many T-States are required for LXI instruction?
1 M
1(j)
If memory has 8192 memory locations, then how many address lines are required?
1 M
1(k)
If the memory size is 256 × 1 bits. How many chips are required to make up-to 1 Kbyte of memory?
1 M
1(l)
What is the total number of T-States required to execute below program.
MVI C,05H
Back: DCR C
JNZ Back
MVI C,05H
Back: DCR C
JNZ Back
1 M
1(m)
Which interrupt has the highest priority?
1 M
1(n)
Explain the instruction: EI
1 M
2(a)
Describe the instruction with example and also show the contents of register/memory locations before and after execution of instruction: XTHL
3 M
2(b)
Show the diagram to generate control signal using NAND gate in 8085.
4 M
Solve any one question from Q.2(c) & Q.2(d)
2(c)
Write 8085 assembly language program for Modulo-10 down counter. After count 00H, the count should go back to repeat the sequence. Provide 1 Sec delay between count and display the count at an output port 01H.
The clock frequency is 1 MHz. Show timing calculations assuming suitable value of T states for various instructions.
7 M
2(d)
Write 8085 assembly language program to perform the following, a2 + b2 ,
where a and b are 8-bit binary numbers.
7 M
Solve any three question from Q.3(a), Q.3(b), Q.3(c) & Q.3(d), Q.3(e), Q.3(f)
3(a)
Compare memory mapped I/O and I/O mapped I/O.
3 M
3(b)
Show only memory map for the 8085 microprocessor such that it should contain 8 kbyte of EPROM and 8 kbyte of RAM.
4 M
3(c)
Draw timing diagram for DAD instruction.
7 M
3(d)
What is the difference between absolute decoding and linear decoding. Explain with example.
3 M
3(e)
Draw memory system and show memory map for the microprocessor system such that it should contain 2 kbyte of EPROM and 2 kbyte of RAM with starting addresses 0000H and 6000H
4 M
3(f)
Draw timing diagram for STA instruction.
7 M
Solve any three question from Q.4(a), Q.4(b), Q.4(c) & Q.4(d), Q.4(e), Q.4(f)
4(a)
Draw control word format for Bit Set/Reset for 8255 IC.
3 M
4(b)
Write a program to initialize 8255 in the configuration given below:
Port A as simple input, Port B as simple output, Port CL as output and Port CU as input. Assume address of the control word register of 8255 as 83H.
4 M
4(c)
Consider that 4 LEDs are connected to port CL of 8255 chip. Address of port C is 82H and control register is 83H. Write a program to flash 4 LEDs 10 times. Assume persistence of vision to be 0.1 seconds. Consider operating frequency 2.5 MHz.
7 M
4(d)
Draw control word format for I/O mode of 8085.
3 M
4(e)
Write a BSR control word subroutine only to set PC7 and PC3 and reset them after 10ms delay. (do not calculate for delay)
4 M
4(f)
Write a program to generate square wave using digital to analog converter 0808.
7 M
Solve any three question from Q.5(a), Q.5(b), Q.5(c) & Q.5(d), Q.5(e), Q.5(f)
5(a)
State any three features of 8259 programmable interrupt controller.
3 M
5(b)
What are the function of below pins of 8251 USART 1. DSR', DTR', RTS', CTS'.
4 M
5(c)
Draw and explain the functional block diagram of 8253 timer IC.
7 M
5(d)
State any three features of Intel 8086 Microprocessor.
3 M
5(e)
What are the advantages of Memory segmentation in 8086
4 M
5(f)
Draw and explain the functional block diagram of interrupt controller IC 8259.
7 M
More question papers from Microprocessor And Interfacing