how to use the 16MB SDRAM on keil MCB 1800?

Look for examples under the packs downloaded for the chip/board in uV5

This has initialization code for the SDRAM

C:\Keil474\ARM\Boards\Keil\MCB1800\Demo\system_LPC18xx.c

Perhaps there is a manual describing options/settings, be where I'd look...

I read the file but didn´t understand the usge of sdram and EMC. Please can you share any sample program for sdram only??

Perhaps NXP has resources, examples or forum you can use? Good technical support from competent engineers tends to be expensive.

The particular memories tend to be board specific, so the MCU needs to be configured with all the details before it can utilize them.

You really need to understand this stuff for yourself. It is going to be a function of enabling clocks, enabling pins, setting up the external memory controller for the geometry of device the board has, and configuring the memory chip itself. Most embedded engineers would be expected to perform these tasks, or engage a contractor to provide working code. I don't have code I can furnish you with, you'll have to seek out examples with Google, or on GitHub, etc.

There should be schematics for the Keil MCB1800 board

http://www.keil.com/mcb1800/

http://www.keil.com/mcb1800/MCB1800v1-3-schematics.pdf

and there are no doubt technical manuals for the NXP MCU to provide additional context.

Shreyas007 said:

didn´t understand the usge of sdram and EMC

So which part(s) didn't you understand?

As Westonsupermare Pier, the NXP documentation & forums are the place to go for help and support with how the chip works - that's nothing to do with Keil.

Have you checked on the NXP site for application notes, examples, etc ?

You would also have to study the documentation for the SDRAM chip.

Andy Neil said:

Have you checked on the NXP site for application notes

Westonsupermare Pier said:

you'll have to seek out examples with Google

eg, just putting "LPC1857 sdram" into google, the very first hit is: