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i m using micro-controller p89v51rd2 in that i m trying program of keypad which out put show on 7 segment but in that when i m hold the key than out put will be show but after relished the key out put dont show or say my out put was not hold. so any one tell me how to hold my out put.
What "program" are you trying?
How do you expect anyone to comment on - let alone debug - your "program" without seeing it?!
"after released the key out put dont show"
What did you expect it to show?
"or say my out put was not hold"
Did you program it to do that?
If you didn't program it to do that, then it obviously won't do it!
If you did program it to do that, and it doesn't, then there is a bug in your program - so you need to debug it!
For tips on debugging, see: www.8052.com/.../120313