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06000EE309122001

PART C
Answer any two full questions, each carries 10 marks.
List the field of applications for an embedded system

In a microprocessor 8085 based system requires one 2K x 8 EPROM and IK x 8
RAM. Write the address range of each memory chip and also draw the interface
diagram. Use 3 to 8 decoder
Draw the control word format for the I/O mode of 8255
Make control word when the ports of Intel 8255 are defined as follows:
(i) Port A as an input port (ii) Mode of the Port A-Mode 0 (iii)Port B as an output
port (iv) Mode of the port B- Mode 0 (v) Port Cupper as an input port (vi) Port
ಲ್ಕ 88 an Output port
With a neat diagram explain water fall model. What are its disadvantages?
PART 0

Answer any two full questions, each carries 10 marks.
Assume that external crystal frequency (XTAL) =11.0592 MHz. What value do
we need to load into the timer’s register if we want to have a time delay of Sms?
Show the ALP for Timer 0 to create a pulse width of Sms on P2.3 (Assume Mode
1 operation and software control for Timer 0)
Explain with neat diagram the Register organisation and SFR in 8051.
Explain the operation of following instructions
(i)SWAP A (ii)CPL C (iii) MOV २१, ೫05, (iv) RL A
Draw the TMOD register of 8051. Indicate which mode and which timer are

selected for each of the following i) MOV TMOD, #10H ii) MOV TMOD, #02H

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