can anyone give me guidance about moving message display concept
Hiya, It depends on which display you ask about. If you mean the LCD then there are some ways to move a message. Firstly, you may use special LCD commands (for example, command 00011Dxx, where D is direction). This way gives you a chance to move and show about 40 chars via 16-chars display. Another limit is that a dual-line LCD will move both lines at each command. Second way is different: 1) make a buffer enough for your message; put to there a message started and ended with both 16 empty chars (0x20); be careful to delete null-terminator sign of a string; 2) init LCD; 3) set a pointer to the buffer; 4) send 16 bytes from pointer to LCD; 5) wait appropriate time depends on moving speed; 6) increase pointer by 1; do repeat from step 4 as long as last char of your message gone out from display area (size of you message + 16). Okay, if you talk about LED matrix dot display so then it depends on shematic of a board and may be very different and difficult from described above.
Thanks for your support sorry I do not mention that I am working on Dot Matrics 7x5(Total of 19 Matric attached with 89c51 & 74164 I sent a single character on display which is clearly visible on serially connected matrics with 74164 on second time when I sent 00 data and again sent data on matrics, it break the data on dot matrics. Kindly Guide me for this and how can I send u my code which is on assembly language. Thanks AFZAAL BAIG