b) Draw the memory map and briefly explain the memory organization for 128 byte (10)
internal RAM of 8051 microcontroller.
6 a) Explain the functions of ports in 8051 microcontroller. How can P1 be used as (10) ‏طامط‎
‎output and input port?
b) List the addressing modes of 8051 with proper examples. (5)
PARTC
Answer any two full questions, each carries 20 marks.
a) Explain, with necessary diagrams, how a 4-winding stepper motor can be
interfaced and rotated in steps. Assume normal 4-step sequence data as 09H,
OCH, 06H and 03H respectively.
b) Draw and explain the formats of TMOD, TCON, SCON, IE and IP registers of
8051 microcontroller.
a) Write an assembly language program using 8051 microcontroller instructions to
generate a square wave at port 1, pin 0. The frequency of the generated square
wave is to be | kHz.
b) Draw and explain interfacing diagram of DAC with 8051 microcontroller. Write
program to generate square wave of 40 % duty cycle at the output of DAC.
a) Write program to transfer the message “KTU” serially at 4800 baud rate, 8-bit
data, 1 stop bit.
b) Explain the interfacing of 8 bit ADC using 8051 microcontroller.

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