Wednesday, 13 June 2012

BCD TO SEVEN SEGMENT DISPLAY EMBEDDED C




BCD TO SEVEN SEGMENT DISPLAY




THEORY:
     A 7-segment display is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot-matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters, and other electronic devices for displaying numerical information.
The seven segments are arranged as a rectangle of two vertical segments on each side with one horizontal segment on the top, middle, and bottom. The segments of a 7-segment display are referred to by the letters A to G, where the optional DP decimal point (an "eighth segment") is used for the display of non-integer numbers.


BCD I/P
SEGMENT O/P
DISPLAY
g f e d c b a
0   0   0   0
0 1 1 1 1 1 1
0
0   0   0   1
0 0 0 0 1 1 0
1
0   0   1   0
1 0 1 1 0 1 1
2
0   0   1   1
1 0 0 1 1 1 1
3
0   1   0   0
0 1 1 0 0 1 1
4
0   1   0   1
1 1 0 1 1 0 1
5
0   1   1   0
0 0 1 1 1 1 1
6
0   1   1   1
0 0 0 0 1 1 1
7
1   0   0   0
1 1 1 1 1 1 1
8
1   0   0   1
1 1 0 0 1 1 1
9

CIRCUIT SCHEMATIC & OUTPUT:

PERIPHERAL OUTPUT:
SOURCE CODE:

#include<regx51.h>
sfr out=0xA0; //P3
sfr inp=0x90; //P1
unsigned char temp;
unsigned char const lookup[10]=
           {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};

void main()
{
out=0x00;
inp=0xFF;
while(1)
  {
     temp=inp & 0x0F;
     if(temp>=0x0A)
          out=0x00;
     else
          out=~(lookup[temp]);
  }
}






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