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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.
Isn't that obvious?
When you do detect a key - display it. When you do not detect a key - don't display.
The LCD will remember your last write request so if it overwrites the last key pressed it's because you are always sending out data to the display if or if not a key is pressed.
sir i m using 7 segment not lcd so i want to hold data when another key was not press