Microprocessors and Applications

(b) Describe the function of following pins of 8051 microcontroller (i) PSEN (ii)ALE 9 (iii) EA        (iv) RST. 

(a) What is the operation carried out when 8051 executes the instruction MOVC                          A,@A+DPTR?

(b) Explain the assembler directives of 8051 microcontroller with suitable examples

Sketch the interface of a DAC 08 to the 8051 microcontroller. Write an 8051 assembly program segment to output a ramp signal through the DAC.

(i) What is the function of BSR mode in PPI 8255?

(a) Draw and explain the pin diagram of 8086 microprocessor.

(h) What is use of timing and control unit?

(g) Name all flags in 8051

(f) What is use of maximum mode and minimum mode in 8086?

(e) What is TCON and TMOD of 8051?

(d) What do you mean by machine cycle and instruction cycle?

(c)Write two differences between microcontroller and microprocessor.

(b) Convert the binary code (11010) into octal code and hexadecimal code.

(a) What is the function of RS1 and RSO pins of 8051?..

Sketch and explain the interface of PPI 8255 to the 8086 microprocessor in Minimum mode. Interface & LEDs to the port B of 8255. Interface 8 keys to the port A. Write an 8086-assembly program to read the key status and output on to the 8 LEDs. 

(b) Write an 8051 -assembly program to evaluate the factorial of an integer number N using recursive procedure.

(a) Write an 8051 -assembly program to convert one byte Binary number to BCD.

(b) List the various interrupts in 8051 microcontroller along with their priorities and vector locations. 

(a) Draw the interfacing diagram of RS232 with 8051 and explain its operation.

(a) Explain the functions of each bit of SCON and PCON registers.

(b) Explain in detail the vectored interrupts and specify their memory location with reference to 8085 microprocessor. 

(a) Interface 2K byte of EPROM and 2Kbyte of RAM with 8086 microprocessor.

(b) Explain the concept of segmented memory in 8086 microprocessor? What are its advantages?