Print Page - How to multiplex 4 Anode Com Seven Segement with one port of 8051 in assembly ?

Title: How to multiplex 4 Anode Com Seven Segement with one port of 8051 in assembly ?
Post by: saber on January 09, 2006, 12:04:30 12:04

Hi to all
I build following circuit in the Proteus VSM
(http://tinypic.com/jzv9ea.png)
I want use this circuit for multiplexing 4 Anode Com Seven Segement
with one port of AT89C51 microcontroller in assembly language
That showing the " 2006 " number in the seven segement
I write the program in the assembly language but it not working properly
and I not see the " 2006 " number in the seven segements fixedly
and the seven segements are on and off alternately

I upload the my project's files ( .ASM - .HEX - .DSN ) in following address
http://rapidshare.de/files/10706839/AT89C51_Multiplex_Displays.zip.html
You can download it and see my project

Anybody can write this program in the assembly language ?
Please help me
Thanks a lot :)

Title: Re: How to multiplex 4 Anode Com Seven Segement with one port of 8051 in assembl
Post by: xatax on April 16, 2007, 02:30:54 14:30

File not found. Please re-upload !!!

Best regards.

Title: Re: How to multiplex 4 Anode Com Seven Segement with one port of 8051 in assembly ?
Post by: zuisti on April 17, 2007, 04:18:34 16:18

Please to consider the multiplexed displaying works in the "human eyes" only, beacuse it displays one digit at a time. Press "pause" at times in the Proteus simulation...
zuisti

Title: Re: How to multiplex 4 Anode Com Seven Segement with one port of 8051 in assembly ?
Post by: Dom on April 17, 2007, 04:35:53 16:35

Yes, as zuisti said, you must take the 4 seven segment panel especially used for the multiplexed display like in the example of Proteus (read the help of the four digit component).

Title: Re: How to multiplex 4 Anode Com Seven Segement with one port of 8051 in assembly ?
Post by: sukumar on June 26, 2007, 01:48:27 13:48

Use the following code, The diagram should be modified as per the following code.
ie:PORT2 is DATA port (all the 8 bits) P0=control bits

Code:

#include<reg51.h> 

void send_seg(int,int,int,int);
unsigned char n=1;
unsigned char thou=2,hun=0,ten=0,single=6;
unsigned char a[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
void DelayMs(unsigned char);

void main()
{
	
	P0=P2=0;
	while(1)
	{
		send_seg(thou,hun,ten,single);	
	}
}

void send_seg(int thou,int hun,int ten,int single)
{
if(n==1)
	{
	P0=0x08;
	P2=a[single];
	n=2;
	DelayMs(5);
	}
	else if(n==2)
		 {
			P0=0x04;
			P2=a[ten];
			n=3;
			DelayMs(5);
		 }
		 else if(n==3)
			{
		 	P0=0x02;
			P2=a[hun];
			n=0;
			DelayMs(5);
			}
		else
		{
			P0=0x01;						   
			P2=a[thou];
			n=1;
			DelayMs(5);
		}	
}

void DelayMs(unsigned char Ms)
{
	int i;
	for(i=0;i<Ms*48;i++);
}[/code

Sonsivri

Electronics => General Electronics => Topic started by: saber on January 09, 2006, 12:04:30 12:04