Some readers here will see my wide drawing and think that maybe I fell off my rocker and bumped my head too hard on hearth of the fireplace. In actuality I am quite sane and can say that the whole point of my "wide" drawing is to show Anil Kumar there are many facets to a vague quuestion he has come this forum with. And not just once but three (or was just 2) times. Many responders have made comments to try the make the poster be more specific. I think he has tried but has he succeeded? I think not. As a matter of fact, taken literally, the subject line of the thread which was "led's a port pin can drive" sounds to me like a question. My wide response I think is in direct reply to that question!!

In the body of his post he talks in even more general terms as "i want to know the maximum number number of led's that can be driven by AT89C51 microcontroller." Am I to take that to mean that all of the I/O pins of the AT89C51 are meant to be involved in the LED driving business? It that is the case then the part, with its 32 I/O pins, should be able support up to 32 copies of the circuit in my wide picture. With 10,000 LEDs supported by one pin the complete microcontroller should be able to support almost one third of a million LED's !!!

Now if Anil comes back and says .... "No No Mr Karas your drawing is not at all what I have in mind"... then I think it will have served its purpose in helping Anil to clarify anf communicate just what he is looking for. For the rest of those that see it, I hope you just have fun with it and let it jiggle your giblets for five minutes.

Michael Karas