I'd say that's almost invariably so!

In this case, the first thing to do must be to get familiar with the 8052.

Start by reading the documents often known as "the bible" of the 8052 family:

http://www.semiconductors.philips.com/acrobat/v...ARCH_1.pdf
http://www.semiconductors.philips.com/acrobat/v...UIDE_1.pdf
http://www.semiconductors.philips.com/acrobat/v...WARE_1.pdf

Look at the Tutorials on this site:

http://www.8052.com/tutorial.phtml

You will also need to get to know your tools;
If you intend using Keil, you should read the uVision Getting Started guide, and work through the example projects in it

You can download a free evaluation from http://www.keil.com/demo/eval/c51.htm
be sure to read the limitations:
http://www.keil.com/demo/limits.htm

Once you are comfortable with the processor and the tools - then you are ready to start on your application!



Here are some other introductory & reference materials:

http://www.keil.com/books/8051books.asp

http://www.8052.com/books.phtml