access to : http://www.keil.com/support/docs/159.htm

Indeed:
What was the title of the document?
What was it about?
Was it for a specific chip or architecture?

Have you put those details into the 'Search' box?

Have you looked here: http://www.keil.com/appnotes/
Or here: http://www.keil.com/support/knowledgebase.asp

Indeed:
What was the title of the document?
What was it about?
Was it for a specific chip or architecture?

Have you put those details into the 'Search' box?

Have you looked here: http://www.keil.com/appnotes/
Or here: http://www.keil.com/support/knowledgebase.asp