it was my mistake in explaining the problem. Basically I want to display a bar graph using an LED grid.

The display would come to something like this:

F       *
E       *
D   *   *   *
C   * * *   * *
B * * * * * * *  
A * * * * * * *
  0 1 2 3 4 5 6

Where each '*' represents a lighted LED. Initially I was thinking I would be needing to have control over each LED to create the bar-graph.

But I realized that I need to only have control till the highest point, where all LEDs would glow.

Basically to produce the above graph, I need to call a routine
call light_up() in the following way:

light_up(0,B);
light_up(1,D);
light_up(2,C);
light_up(3,F);
light_up(4,B);
light_up(5,D);
light_up(6,C);

Where light_up(m,n) lights up all LEDs in the column m, till row n.

Hope I am able to clarify myself better now.
Looking forward to your comments.

regards,
Seemanta