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00000EC305121902

Write an ALP to find the largest among N (count) 8 bit numbers which are stored
in the memory location starting from 4201H. Result should be loaded in the
location 4300H and assume that the count is available in the memory location
4200H.
PART C

Answer any two full questions, each carries 20 marks.
List and describe the modes of operation of timers in 8051.
Describe the interrupt structure of 8051 with IE register and explain how the
interrupts are prioritized in 8051.
List and describe the steps involved in the transmission and reception of data
serially in 8051 using UART with relevant register details.
Describe the interfacing of a stepper motor to 8051 with required diagrams and
ALP to rotate the motor continuously in the clock-wise direction. Assume the
required parameters and justify them.
Describe the interfacing of an 8 bit DAC to 8051 with required diagram and ALP
for generating a stair-case waveform with 2 steps and equal time duration in each
step. Justify the voltage levels and time period with relevant
calculations/descriptions.
Draw the structure and discuss the significance of each bit in SCON register.
For a crystal frequency of 121/1117, find the value to be loaded into TH register for
the Baud rates of 9600 and 150.
Describe the interfacing of 8 DIP switches and 8 LEDs which are connected to
Port 1 and Port 2 of 8051 respectively for reading and displaying the digital

information with relevant diagrams and ALP.

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