http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008 Rickey's World contact@nospam.com (Ajay Bhargav) contact@nospam.com (Ajay Bhargav) Thu, 08 Jan 2009 20:26:32 -0800 Thu, 08 Jan 2009 20:26:32 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php http://www.8051projects.net/forum-t622.html
Here are portion of the code.

count_down:
mov a,count1
dec a
mov count1,a
cjne a,#-1,exit_count
mov count1,#9
mov a,count2
dec a
mov count2,a
cjne a,#-1,exit_count
mov count2,#9
mov a,count3
dec a
mov count3,a
cjne a,#-1,exit_count
mov count3,#9
mov a,count4
dec a
mov count4,a
cjne a,#-1,exit_count
mov count4,#0

exit_count:
ret

The problem were if I put in following value, count1 = 0, count2 = 0, count3 = 1 and count4 = 0, it dosn't display correctly as everytime the 'dec' command was execute it fill in number 9 to previous count varible.

How to fix this problem ?. One more thing, at the end of count down, it doesn't display 0000, instead it display 9990.

Thanks all.
SGH
]]> Wed, 28 Mar 2007 22:02:41 -0700 http://www.8051projects.net/forum-t622.html http://www.8051projects.net/forum-t622.html cjne a,#-1,exit_count
mov count1,#9

this will surely make count 1 = 9 coz, after you dec count1 it will become -1 from 0. so according to statement, cjne(compare and jump if not equal) it will exit only if its not equal, but here its equal so, it will execute the next statement, so 9 is loaded in count1. so u are getting that result.

I made a program, but i want you to try it first, so giving you hint, you need to decrement the last digit, untill it become zero and when it become zero decrement the second digit, keep on doing this, utill u end up with all zeros!
i hope you got some idea, how to implement it, there are lot of compare jumps to be made i think, try it, if you don't get result, i will help you ]]> contact@nospam.com (Ajay Bhargav) Thu, 29 Mar 2007 05:17:25 -0700 http://www.8051projects.net/forum-t622.html http://www.8051projects.net/forum-t622.html contact@nospam.com (Ajay Bhargav) Thu, 29 Mar 2007 19:12:59 -0700 http://www.8051projects.net/forum-t622.html http://www.8051projects.net/forum-t622.html
So my progress in this code is slow. It is ok for me as this is part of the learning process.


SGH]]> contact@nospam.com (Ajay Bhargav) Sat, 21 Apr 2007 08:56:32 -0700 http://www.8051projects.net/forum-t622.html http://www.8051projects.net/forum-t622.html
for any assistance i am here.]]> contact@nospam.com (Ajay Bhargav) Sat, 21 Apr 2007 10:55:48 -0700 http://www.8051projects.net/forum-t622.html http://www.8051projects.net/forum-t622.html
More hints please.

Thanks,
SGH]]> contact@nospam.com (Ajay Bhargav) Wed, 30 May 2007 20:37:10 -0700 http://www.8051projects.net/forum-t622.html http://www.8051projects.net/forum-t622.html contact@nospam.com (Ajay Bhargav) Wed, 30 May 2007 22:53:00 -0700 http://www.8051projects.net/forum-t622.html