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paper of Embedded 8051 register, LCD, ds1307 .

Exam section of megasasta.com

Paper of 8051 register, LCD, ds1307 in Embedded

Course=Embedded
Subject=8051 register, LCD, ds1307

Question no-1
How many 24c02 EPROM can be connected on same I2C Bus


Optional Answers

(a)                  1

(b)                  2

(c)                  4

(d)                  8

Sollution

(d)                  8

Question no-2
How many bytes of RAM is available free(other than timing registers) in DS1307 for the use of controller like 8051


Optional Answers

(a)                  10 bytes

(b)                  100 bytes

(c)                  64 bytes

(d)                  56 bytes

Sollution

(d)                  56 bytes

Question no-3
Use of out bit (control register) in ds1307 is


Optional Answers

(a)                  Gives square wave on SQW/OUT pin of DS1307

(b)                  Control voltage level when SQWE = 0

(c)                  Enable SQW/OUT pin of DS1307

(d)                  Control the timing registers

Sollution

(b)                  Control voltage level when SQWE = 0

Question no-4
Required Voltage on VBAT pin of Ds1307


Optional Answers

(a)                  1V

(b)                  2.5V

(c)                  3V

(d)                  5V

Sollution

(c)                  3V

Question no-5
Crystal frequency required in DS1307 is


Optional Answers

(a)                  32.768Hz

(b)                  32.768kHz

(c)                  32.768MHz

(d)                  32.768GHz

Sollution

(b)                  32.768kHz

Question no-6
Pages on graphical LCD 128x64 is control by register having value for


Optional Answers

(a)                  X register

(b)                  Y register

(c)                  Z register

(d)                  A register of 8051

Sollution

(a)                  X register

Question no-7
CS1 and CS2 pin of graphical LCD use to


Optional Answers

(a)                  Select chip1 and chip2

(b)                  Latch data with LCD display

(c)                  Turn on and off your LCD

(d)                  none of the above

Sollution

(a)                  Select chip1 and chip2

Question no-8
Output on PORT0 of 8051 after execution of below embedded c code
void main()
{Unsigned char a;
Unsigned int b;
Unsigned long int c;
a=0x2855;
b=0x2855;
c=0x2855;
a>>=8;
b>>=8;
c>>=8;
P0=a;
while(1);
}


Optional Answers

(a)                  0x2855 on port0 of 8051

(b)                  0x00 on port0 of 8051

(c)                  0x28 on port0 of 8051

(d)                  0x55 on port0 of 8051

Sollution

(b)                  0x00 on port0 of 8051

Question no-9
After reset in 8051 default state of PORT2 is


Optional Answers

(a)                  It behaves as input if using assembly language for programming

(b)                  It behaves as ouput if using embedded c for programming

(c)                  it behaves as input if using embedded c for programming

(d)                  it behaves as input for assembly and embedded c programming both

Sollution

(d)                  it behaves as input for assembly and embedded c programming both

Question no-10
When we write program for 8051 in embedded c using keil then


Optional Answers

(a)                  Keil is a cross compiler

(b)                  keil is a programmer

(c)                  keil is a burner for 8051 controller

(d)                  keil is only a text editor for embedded c

Sollution

(a)                  Keil is a cross compiler

Jai guru dev

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