Microcontroller

Comparison between micro-controller and microprocessor

Sr No.	Microcontroller	Microprocessor
1.	Inbuilt RAM or ROM	Do not have inbuilt RAM or ROM
2.	Inbuilt Timer	Do not have inbuilt Timer
3.	I/O ports are available	I/o ports are not available ,requires extra device like 8155 or 8255.
4.	Inbuilt serial port	Do not have inbuilt serial port , requires extra devices like 8250 or 8251
5.	Separate memory to store program and data	Program and data are stored in same memory
6.	Few instructions to read or write data to or from external memory.	Many instructions to read or write data from or to external memory.

A microcontroller is an entire computer manufactured on a single chip. Microcontrollers are usually dedicated  devices embeded within an application
Example microcontrollers are used as engine controllers in engine automobiles and as exposure and focus controllers in cameras .

Features of 8051:-

• 8 bit bus and 8 bit ALU.
• 16 bit address bus  -64 KB of RAM and ROM.
• On-chip RAM 128(256 ) bytes (Data Memory) and On Chip ROM -4 KB (Program memory)
• Four 8 -bit bi directional input /output ports.
• Programmable serial ports i.e. One UART(serial port).
• Power saving mode.
• All modern versions are CMOS.

Computer Questions

1.When data and acknowledgement are sent in the same frame ,this is called as
A) Piggy packing
B) Piggy backing
C) Back packing
D) Good packing

Answer:-B) Piggy backing

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2.Encryption and Decryption is the responsibility of ________Layer.
A) Physical
B) Network
C) Application
D) Datalink

Answer:- C) Application

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3.An analog signal carries 4 bits in each signal unit .If 1000 signal units are sent per second ,then baud rate and bit rate of the signal are ____ and ____.
A) 4000 bauds \ sec & 1000 bps
B) 2000 bauds \ sec & 1000 bps
C) 1000 bauds \ sec & 500 bps
D) 1000 bauds \ sec & 4000 bps

Answer:- D) 1000 bauds \ sec & 4000 bps

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4.The VLF and LF bauds use ______ propagation for communication.
A) Ground
B) Sky
C) Line of sight
D) Space

Answer:- A) Ground

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5) Using the RSA public key crypto system ,if p=13 q=31 and d=7,then the value of e is
A) 101
B) 103
C) 105
D) 107

Answer:- 105

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6)FAN IN of a component A is defined as
A) Number of components that can call or pass control to component A
B) Number of components that are called by component A.
C) Number of components related to component A.
D) Number of components dependent on component A.

Answer:-A) Number of components that can call or pass control to component A

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7) The relationship of data elements in a module is called
A) Coupling
B)  Modularity
C) Cohesion
D) Granularity

Answer:- C) Cohesion

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8)Software Configuration Management is the discipline for systematically controlling
A) the changes due to the evolution of work products as the project proceeds.
B) the changes due to defects (bugs) being found and then fixed
C)the changes due to requirement changes
D) all the above

Answer:- D) all the above

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9) Which one the following is not a step of requirement engineering?
A) Requirement elicitation
B) Requirement analysis
C) Requirement design
D) Requirement documentation

Answer:- C) Requirement design

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10)Testing of software with actual data and in actual environment is called
A) Alpha testing
B) Beta testing
C) Regression testing
D) None of the above

Answer:- B) Beta testing

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11) The student marks should not be greater than 100 .This is
A) Integrity constraint
B) Referential constraint
C) Over-defined constraint
D) Feasible constraint

Answer:- A) Integrity constraint

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12) Which of the following operators can not be overloaded in C++?
A) *
B) +=
C) ==
D) ::

Answer :- D) ::

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