Electronics and Communication Engineering (ECE)

The I/O devices in 8085 microprocessor can be used in:
  • a)
    Either Memory mapped I/O or I/O mapped I/O
  • b)
    I/O mapped I/O only
  • c)
    Both B and D
  • d)
    Memory mapped I/O only
Correct answer is option 'D'. Can you explain this answer?

Geet Naman answered  •  4 days ago
In an 8085 microprocessor, the I/O devices can be used is a memory mapped I/O only. An 8085 microprocessor is an 8 – bit microprocessor that is designed by the Intel in 1977 using the NMOS technology.  This 8085 microprocessor has an 8 – bit data bus, a 16 – bit address bus, a 16 – bit program counter, a 16 – bit stack pointer, Six 8-bit registers arranged in pairs like BC, DE, HL. This processor is usually found in mobile phones, washing machines, microwave ovens.

Consider the following statements regarding the properties of transfer function:
1. The transfer function is independent of the input of the system.
2. The transfer function is defined for linear time- variant system.
3. The transfer function of a continuous-data system is expressed only as a function of the complex variable s.
4. All the initial conditions are not necessarily set to zero for finding the transfer function of a given system.
Q. Which of the above statements is/are not true?
  • a)
    1, 3 and 4 only
  • b)
    2, 3 and 4 only
  • c)
    1 and 3 only
  • d)
    All of the above
Correct answer is option 'D'. Can you explain this answer?

Lakshmi Priya Ghildiyal answered  •  5 days ago
Correct Answer :- D
Explanation : The properties of transfer function are given below:
1) The ratio of Laplace transform of output to Laplace transform of input assuming all initial conditions to be zero.
2) The transfer function of a system is the Laplace transform of its impulse response under assumption of zero initial conditions.
3) Replacing ‘s’ variable with linear operation D = d/dt in transfer function of a system, the differential equation of the system can be obtained.
4) The transfer function of a system does not depend on the inputs to the system.
5) The system poles and zeros can be determined from its transfer function.

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