Hello all,

How r u....


I want to develop a 8051 system with very large lookup table. Obviously it will be more than 4K code size what will not fit in the internal FLash of 8051. so I will have to use external FLash memory. I was searching in Google and other search engines for so many times to get any article which will show an example of this kind of project. I found the hardware schematics of adding external memory, well, but I am really confused how the C code will look like for this kind of project. Moreover, If I burn the internal flash with the code and If I wanna store a lookup table in a Flash memory and In my program I wanna fetch the database from that external FLASH, what could be the C code. I am using Keil C51 Evaluation version as I feel very comfortable with this. I am dreaming of buying this expensive software but very hard to afford, so may be someday I will buy this software.

Would you please provide me any very short example C code for this kind of project. Moreover, I always hear about data memory what comes with the 8051, but what is the use of this data memory ? Can i store lookup table in this data memory ? if so , how to store and how to fetch in the running application... I heard that, I can add 64KB Data memory and 64KB Code memory, .. what is the use of external data memory and how can i use it in C. Is it the same solution that I am looking for about large lookup tables...

Thanks and regards,
Emran