Seven Segment Display Interfacing With 8051 Primer
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Transcript of Seven Segment Display Interfacing With 8051 Primer
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8051 HOW-TO GUIDE
Interfacing 7SEG with
8051
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Contents at a Glance
8051 Primer Board ........................................................... 3
I2C (Inter Integrated Circuit) . Error! Bookmark not defined.
Seven Segment Display .................................................... 3
Interfacing Seven Segment Display .................................. 4
Interfacing Seven Segment with 8051 .............................. 5
Pin Assignment with 8051 ................................................ 6
Circuit Diagram to Interface 7 seg with 8051 .................... 7
Source Code .................................................................... 7
C Program to 7 Segment Display using 8051 ..................... 8
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8051 Primer Board
The 8051 Primer board is specifically designed to help
students to master the required skills in the area of
embedded systems. The kit is designed in such way that all
the possible features of the microcontroller will be easily
used by the students. The kit supports in system
programming (ISP) which is done through serial port.
NXPs 8051 (AT89V51RD2), 8051 Primer Kit is proposed
to smooth the progress of developing and debugging of
various designs encompassing of speed 8-bit
Microcontrollers.
Seven Segment Display
A seven segment display is the most basic electronic
display device that can display digits from 0-9. The most
common configuration has an array of eight LEDs arranged
in a special pattern to display these digits. They are laid out
as a squared-off figure 8. Every LED is assigned a name
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from 'a' to 'h' and is identified by its name. Seven LEDs 'a' to
'g' are used to display the numerals while eighth LED 'h' is
used to display the dot/decimal.
Interfacing I2C - Seven Segment Display
Fig. 1 shows how to interface the seven segments with
microcontroller. Seven segments are generally available in
ten pin package. While eight pins correspond to the eight
LEDs, the remaining two pins (at middle) are common and
internally shorted. These segments come in two
configurations, namely, Common cathode (CC) and
Common anode (CA). In CC configuration, the negative
terminals of all LEDs are connected to the common pins.
The common is connected to ground and a particular LED
glows when its corresponding pin is given high. In CA
arrangement, the common pin is given a high logic and the
LED pins are given low to display a number.
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Fig. 1 Interfacing I2C - 7segment to Microcontroller
Interfacing Seven Segment with 8051
We now want to display a four digit number in 8051
Primer Board by using seven segment displays. The seven
segment display is connected with 801 controllers.
In 8051 Primer Kit, 4 nos. of common anode seven
segment displays are controlled I/O Lines(p1.0-p1.7).The 7-
segmend display is powered from the 5V power supply
enabled by switch SW30.
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Pin Assignment with 8051
7-SEG 8051 Pins 7-Segment Display
Dig
it s
elec
t lin
es
Digit - 1 P3.4
Digit 2 P3.5
Digit 3 P3.6
Digit - 4 P3.7
Segm
en
t Li
ne
s
Seg - a P1.0
Seg b P1.1
Seg c P1.2
Seg d P1.3
Seg e P1.4
Seg f P1.5
Seg g P1.6
Seg dp P1.7
Make switch SW30 to
7SEG label marking position
+5V ON OFF
SW30
PWR ON/OFF
1 2 3 4
8 7 6 5
LCD 7SEG
GLCD SM/RL
Make high to - digit selection
Make low to - segment
f
a
b
c d e
g
VCC
1
2
3
1KDigit - 1
seg-aSeg-bSeg-cseg-d
seg-fseg-e
seg-gseg--dp
U1
7 SEG DISP
E1 D2
CA
3
C4
DP5
B6 A7
CA
8
F9
G10
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Circuit Diagram to Interface 7 seg with 8051
Source Code
The Interfacing seven segment displays with 8051
program is very simple and straight forward that display a
four digit number in seven segment displays by using I/O
Lines. The C programs are developed in Keil software.
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C Program to 7 Segment Display using 8051 ***************************************************************************************
Title : Program to I2C - Seven Segment display ***************************************************************************************
#include
#include
unsigned char SetDisplay(unsigned char);
void delay();
sbit eseg1000 = P3^7;
sbit eseg100 = P3^6;
sbit eseg10 = P3^5;
sbit eseg1 = P3^4;
unsigned char d0,d1,d2,d3;
unsigned char SetDisplay(unsigned char value)
{
unsigned char segment[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x83,0xf8,0x80,0x98};
if(value
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}
//--------------
//Delay Function
//--------------
void delay()
{
int i;
for(i=0; i
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{
eseg1000=0;
eseg100=0;
eseg10=0;
eseg1=1;
P1=SetDisplay(d0);
turn = 2;
delay();
}
else if(turn==2) //7-Seg Display 1
{
eseg1=0;
eseg1000=0;
eseg100=0;
eseg10=1;
P1=SetDisplay(d1);
turn = 3;
delay();
}
else if(turn==3) //7-Seg Display 2
{
eseg10=0;
eseg1=0;
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eseg1000=0;
eseg100=1;
P1=SetDisplay(d2);
turn = 0;
delay();
}
else //7-Seg Display 3
{
eseg100=0;
eseg10=0;
eseg1=0;
eseg1000=1;
P1=SetDisplay(d3);
turn = 1;
delay();
}
if(timer == 100){
d0++;
timer=0;
if(d0>=10){
d0=0;
d1++;
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if(d1>=10){
d1=0;
d2++;
if(d2>=10){
d2=0;
d3++;
if(d3>=10){
d3=0;
}
}
}
}
}
timer++;
}
}
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