Microprocessor and microcontroller

Write a program to generate a delay of 1 milli-second in 8086 microprocessor. 

Explain the need to demultiplex the bus AD₇-AD₀

Write a program using the ADI instruction to add the two hexadecimal numbers 3AH and 48H and to display the answer at the output port. Briefly explain. 

Which addressing mode in 8085 moves a byte (or a word) between a memory location and a register? Also give an example of this type of addressing. 

Ten hexadecimal numbers are stored in RAM locations 50H onwards. Write a program to find the largest number in set. The largest number should be saved in 60H.

How do you classify the 8051 instructions based on i) length of instruction ii) addressing mode ii) function performed? Give two example of each. 

Explain TMOD and TCON registers of 8051 in detail.

Write an assembly language program to move a block of data from the location 5000H to the location 8000H using 8085 microprocessor (for block of 6 byte).

Write a note on memory organization in the 8051 and also write the functions of RSO and RS1 bits in the PSW of 8051.

Explain the interfacing of 8254 with 8086 with the help of neat diagram.

Write a program to generate a delay of 1 milli-second in 8086 microprocessor. 

Write the different features of the programmable interrupt controller(8259). 

How does an 8086 microprocessor recognize an NMI interrupt?

Compare the merits and demerits of asynchronous communication with synchronous communication.

What are the classes of control transfer instruction used in 8051 microcontroller?

What are the advantages of microprogrammed control?

What are the different registers in 8085 What are the different programmable microprocessor? Explain all.  

Explain the interfacing of 8 bit DAC with 8086 through 8255 in IO mapped 10 technique. Also write a program to generate square wave.

What are the different vectored interrupts in 8085 microprocessor? Briefly explain. 

In what way is the Intel 8253 timer different from the Intel 8254 timer?

What are the ways to mask an interrupt in 8051 microcontroller? 

Write the format of the 8051 processor status word (PSW).

How can you put the 8051 microcontroller in an idle mode?

Write an assembly language program in 8051 to find 2's complement of a number.

Explain the complete architecture of Intel 8051 microcontroller with suitable diagram.

Draw the functional pin diagram of keyblard and display controller(8279).

Interface a DAC to the 8086 microprocessor with a clock frequency of 5 MHz and write program to generate a ramp waveform of T=3 msec.

What is the function of data bus buffer in USART (8251)?

Explain input and output modes of operation of 8279 in detail.

How can 8255 be made to work in handshaking mode? Specify the input mode and output mode separately.

Write an 8086 assembly language program to find the factorial of the given byte of data using a recursive algorithm.

Explain the different data transfer instructions in 8086 giving examples for each. 

The contents of different registers in 8086 are given by CS=FOOOH, DS-1000H, SS= 2000H and ES =3000H. Find base address of the different segments in the memory. 

Why is memory divided into the segments in the 8086 microprocessor? 

What is the main difference between minimum and maximum mode operation of 8086 microprocessor? 

Explain how many times the following loop will be executed:

LXI B,0007H

LOOP: DCX B

           MOV A.B

           ORA C

           JNZ LOOP

Draw the architecture of 8253 timer and write down its control word. Explain its working

Attempt :

Explain 10/M ALE pin of 8085 Microprocessor. 

By giving suitable examples explain different addressing modes of 8051 microcontroller.

Show the Internal RAM structure of 8051 microcontroller.

Briefly discuss the features of 8051 Microcontroller.

Discuss various flag of 8086.

Draw the register organization of 8086 and explain typical applications of each register.

What do you mean by pipelined architecture? How is it implemented in 8086?

Write a program to display the following "ALL OF US ARE HERE" and rotate it in address and data LEDS. Use 8279 chip.

Attempt :

 What are flag registers? Explain auxiliary carry and parity flag of 8085 microprocessor. 

An 8 bit ADC is being used for digitising an analog sensor output. If ADC output pins are connected to port A of 8255. SOC and EOC pin are connected to PCO and PC7 respectively. WAP to input the sensor data every minute and store it in memory location EXDATA.

Interface a 8255 PPI with 8085 such that control register address is FFH.

Interrupt requests are arriving at RST 6.5 pin, at a rate of 200 requests/second. Write a program to utilize these pulses, to design a real time clock, which will count up to 1 hour. Keep the count of seconds, minutes and hour in 3 memory locations SECOND, MINUTE and HOUR respectively. Once 1 hour is over, disable the interrupts. Assume interrupting pulses are sufficiently long enough to be recognized.

Write RIM and SIM word structure of 8085 and explain the function of each it.

What do you understand by FEO? Explain by giving suitable examples.

Show the timing diagram of MOV A,B.

Interface a 4K ROM and BK RAM with 8085 (take starting address of RAM 6000H).

Explain the use of WZ registers of 8085.

Write a program to find the square root of a number. Also explain it with the help of suitable flow chart. 

Explain architecture of 8251 USART with the help of neat diagram.

Explain the interfacing of 8254 with 8086 with the help of neat diagram .

What are the difference between 8085 and 8086 microprocessor architecture?

Write a program to find the factorial of a given number using 8086 microprocessor

With the help of neat diagram, explain the architecture of 8086 microprocessor along with function of each block and register. 

Explain the difference between 8253 and 8254 IC.

Draw and explain hardware interrupt structure 8085 microprocessor.

Write a program to generate Fibonacci series.

Show the internal architecture of 8085 and write down its features.

Attempt

Explain the difference between MOVX and MOVC instruction of 8051 microcontroller 

Attempt

Find the period of the machine cycle if crystal frequency for 8051 based system is 11.0592 MHz.

Attempt

Write operating modes of 8253.

Attempt

What will be the contents of carry flag and zero flag after execution of instruction CMP C if register A contains 70H and resister C contains 27H.

Attempt

Explain the function of bus interface unit.

Attempt

Why IC8259 is needed? 

Attempt

Explain control word register of 8255.

Attempt

Explain how physical address is generated in 8086 microprocessor?